61565561080 has 32 divisors (see below), whose sum is σ = 141136149600. Its totient is φ = 24161577856.

The previous prime is 61565561069. The next prime is 61565561119. The reversal of 61565561080 is 8016556516.

It is a super-2 number, since 2×61565561080² (a number of 22 digits) contains 22 as substring.

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, 14518060 + ... + 14522299.

It is an arithmetic number, because the mean of its divisors is an integer number (4410504675).

Almost surely, 2^61565561080 is an apocalyptic number.

It is an amenable number.

61565561080 is an abundant number, since it is smaller than the sum of its proper divisors (79570588520).

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

61565561080 is a wasteful number, since it uses less digits than its factorization.

61565561080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29040423 (or 29040419 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 61565561080 in words is "sixty-one billion, five hundred sixty-five million, five hundred sixty-one thousand, eighty".