61169513568 has 24 divisors (see below), whose sum is σ = 160569973368. Its totient is φ = 20389837824.

The previous prime is 61169513567. The next prime is 61169513641. The reversal of 61169513568 is 86531596116.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 61169513568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61169513567) 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, 318591121 + ... + 318591312.

It is an arithmetic number, because the mean of its divisors is an integer number (6690415557).

Almost surely, 2^61169513568 is an apocalyptic number.

It is an amenable number.

61169513568 is an abundant number, since it is smaller than the sum of its proper divisors (99400459800).

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

61169513568 is a wasteful number, since it uses less digits than its factorization.

61169513568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637182446 (or 637182438 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 51.

The spelling of 61169513568 in words is "sixty-one billion, one hundred sixty-nine million, five hundred thirteen thousand, five hundred sixty-eight".