61513500408 has 16 divisors (see below), whose sum is σ = 153783751080. Its totient is φ = 20504500128.

The previous prime is 61513500397. The next prime is 61513500409. The reversal of 61513500408 is 80400531516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61513500409) 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, 1281531235 + ... + 1281531282.

Almost surely, 2^61513500408 is an apocalyptic number.

It is an amenable number.

61513500408 is an abundant number, since it is smaller than the sum of its proper divisors (92270250672).

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

61513500408 is a wasteful number, since it uses less digits than its factorization.

61513500408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563062526 (or 2563062522 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 61513500408 in words is "sixty-one billion, five hundred thirteen million, five hundred thousand, four hundred eight".