61857229988 has 24 divisors (see below), whose sum is σ = 108395519232. Its totient is φ = 30887115264.

The previous prime is 61857229957. The next prime is 61857230003. The reversal of 61857229988 is 88992275816.

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, 13234820 + ... + 13239492.

It is an arithmetic number, because the mean of its divisors is an integer number (4516479968).

Almost surely, 2^61857229988 is an apocalyptic number.

It is an amenable number.

61857229988 is a deficient number, since it is larger than the sum of its proper divisors (46538289244).

61857229988 is a wasteful number, since it uses less digits than its factorization.

61857229988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8411 (or 8409 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 65.

The spelling of 61857229988 in words is "sixty-one billion, eight hundred fifty-seven million, two hundred twenty-nine thousand, nine hundred eighty-eight".