61161660 has 72 divisors (see below), whose sum is σ = 212031456. Its totient is φ = 13979520.

The previous prime is 61161649. The next prime is 61161671. The reversal of 61161660 is 6616116.

It is an interprime number because it is at equal distance from previous prime (61161649) and next prime (61161671).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23011 + ... + 25530.

Almost surely, 2^61161660 is an apocalyptic number.

61161660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61161660 is an abundant number, since it is smaller than the sum of its proper divisors (150869796).

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

61161660 is a wasteful number, since it uses less digits than its factorization.

61161660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48563 (or 48558 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 61161660 is about 7820.5920491993. The cubic root of 61161660 is about 393.9971569963.

Adding to 61161660 its reverse (6616116), we get a palindrome (67777776).

It can be divided in two parts, 6116 and 1660, that added together give a 5-th power (7776 = 6⁵).

The spelling of 61161660 in words is "sixty-one million, one hundred sixty-one thousand, six hundred sixty".