115551660 has 192 divisors, whose sum is σ = 391910400. Its totient is φ = 24880128.

The previous prime is 115551659. The next prime is 115551661. The reversal of 115551660 is 66155511.

It is an interprime number because it is at equal distance from previous prime (115551659) and next prime (115551661).

It is a super-2 number, since 2×115551660² = 26704372257511200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (115551661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 645451 + ... + 645629.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200).

Almost surely, 2^115551660 is an apocalyptic number.

115551660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 115551660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195955200).

115551660 is an abundant number, since it is smaller than the sum of its proper divisors (276358740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

115551660 is a wasteful number, since it uses less digits than its factorization.

115551660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 115551660 is about 10749.4958021295. The cubic root of 115551660 is about 487.0707648462.

It can be divided in two parts, 115 and 551660, that added together give a triangular number (551775 = T₁₀₅₀).

The spelling of 115551660 in words is "one hundred fifteen million, five hundred fifty-one thousand, six hundred sixty".