61631297850 has 24 divisors (see below), whose sum is σ = 152845619040. Its totient is φ = 16435012720.

The previous prime is 61631297813. The next prime is 61631297909. The reversal of 61631297850 is 5879213616.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61631297850.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205437510 + ... + 205437809.

It is an arithmetic number, because the mean of its divisors is an integer number (6368567460).

Almost surely, 2^61631297850 is an apocalyptic number.

61631297850 is an abundant number, since it is smaller than the sum of its proper divisors (91214321190).

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

61631297850 is a wasteful number, since it uses less digits than its factorization.

61631297850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410875334 (or 410875329 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 61631297850 in words is "sixty-one billion, six hundred thirty-one million, two hundred ninety-seven thousand, eight hundred fifty".