61031169638 has 4 divisors (see below), whose sum is σ = 91546754460. Its totient is φ = 30515584818.

The previous prime is 61031169623. The next prime is 61031169643. The reversal of 61031169638 is 83696113016.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15257792408 + ... + 15257792411.

It is an arithmetic number, because the mean of its divisors is an integer number (22886688615).

Almost surely, 2^61031169638 is an apocalyptic number.

61031169638 is a deficient number, since it is larger than the sum of its proper divisors (30515584822).

61031169638 is a wasteful number, since it uses less digits than its factorization.

61031169638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30515584821.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 61031169638 in words is "sixty-one billion, thirty-one million, one hundred sixty-nine thousand, six hundred thirty-eight".