61566594972 has 12 divisors (see below), whose sum is σ = 143655388296. Its totient is φ = 20522198320.

The previous prime is 61566594941. The next prime is 61566594977. The reversal of 61566594972 is 27949566516.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61566594977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565274779 + ... + 2565274802.

It is an arithmetic number, because the mean of its divisors is an integer number (11971282358).

Almost surely, 2^61566594972 is an apocalyptic number.

It is an amenable number.

61566594972 is an abundant number, since it is smaller than the sum of its proper divisors (82088793324).

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

61566594972 is a wasteful number, since it uses less digits than its factorization.

61566594972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130549588 (or 5130549586 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 60.

The spelling of 61566594972 in words is "sixty-one billion, five hundred sixty-six million, five hundred ninety-four thousand, nine hundred seventy-two".