166765560 has 128 divisors (see below), whose sum is σ = 549218880. Its totient is φ = 40255488.

The previous prime is 166765559. The next prime is 166765561. The reversal of 166765560 is 65567661.

It is an interprime number because it is at equal distance from previous prime (166765559) and next prime (166765561).

It is a super-2 number, since 2×166765560² = 55621504004227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166765561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81672 + ... + 83688.

Almost surely, 2^166765560 is an apocalyptic number.

166765560 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 166765560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274609440).

166765560 is an abundant number, since it is smaller than the sum of its proper divisors (382453320).

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

166765560 is a wasteful number, since it uses less digits than its factorization.

166765560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2093 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 166765560 is about 12913.7740416967. The cubic root of 166765560 is about 550.4300328252.

The spelling of 166765560 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, five hundred sixty".