61566051616 has 48 divisors (see below), whose sum is σ = 128376783360. Its totient is φ = 28963517440.

The previous prime is 61566051551. The next prime is 61566051641. The reversal of 61566051616 is 61615066516.

61566051616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61566051616² (a number of 22 digits) contains 22 as substring.

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, 2007921 + ... + 2038351.

It is an arithmetic number, because the mean of its divisors is an integer number (2674516320).

Almost surely, 2^61566051616 is an apocalyptic number.

It is an amenable number.

61566051616 is an abundant number, since it is smaller than the sum of its proper divisors (66810731744).

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

61566051616 is a wasteful number, since it uses less digits than its factorization.

61566051616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34177 (or 34169 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 61566051616 in words is "sixty-one billion, five hundred sixty-six million, fifty-one thousand, six hundred sixteen".