61546665660 has 24 divisors (see below), whose sum is σ = 172330664016. Its totient is φ = 16412444160.

The previous prime is 61546665647. The next prime is 61546665709. The reversal of 61546665660 is 6656664516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512888821 + ... + 512888940.

It is an arithmetic number, because the mean of its divisors is an integer number (7180444334).

Almost surely, 2^61546665660 is an apocalyptic number.

61546665660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61546665660 is an abundant number, since it is smaller than the sum of its proper divisors (110783998356).

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

61546665660 is a wasteful number, since it uses less digits than its factorization.

61546665660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025777773 (or 1025777771 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 61546665660 in words is "sixty-one billion, five hundred forty-six million, six hundred sixty-five thousand, six hundred sixty".