61690994831438 has 16 divisors (see below), whose sum is σ = 105760505209344. Its totient is φ = 26437869267480.

The previous prime is 61690994831423. The next prime is 61690994831441. The reversal of 61690994831438 is 83413849909616.

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, 93703370 + ... + 94359437.

It is an arithmetic number, because the mean of its divisors is an integer number (6610031575584).

Almost surely, 2^{61690994831438} is an apocalyptic number.

61690994831438 is a deficient number, since it is larger than the sum of its proper divisors (44069510377906).

61690994831438 is a wasteful number, since it uses less digits than its factorization.

61690994831438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188086247.

The product of its (nonzero) digits is 241864704, while the sum is 71.

The spelling of 61690994831438 in words is "sixty-one trillion, six hundred ninety billion, nine hundred ninety-four million, eight hundred thirty-one thousand, four hundred thirty-eight".