61165680 has 40 divisors (see below), whose sum is σ = 189614352. Its totient is φ = 16310784.

The previous prime is 61165661. The next prime is 61165681. The reversal of 61165680 is 8656116.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61165681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127189 + ... + 127668.

Almost surely, 2^61165680 is an apocalyptic number.

61165680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61165680 is an abundant number, since it is smaller than the sum of its proper divisors (128448672).

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

61165680 is a wasteful number, since it uses less digits than its factorization.

61165680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254873 (or 254867 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 61165680 is about 7820.8490587659. The cubic root of 61165680 is about 394.0057889501.

The spelling of 61165680 in words is "sixty-one million, one hundred sixty-five thousand, six hundred eighty".