65381791850 has 24 divisors (see below), whose sum is σ = 124576237548. Its totient is φ = 25514844800.

The previous prime is 65381791843. The next prime is 65381791949. The reversal of 65381791850 is 5819718356.

It can be written as a sum of positive squares in 6 ways, for example, as 8936109961 + 56445681889 = 94531^2 + 237583^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 65381791792 and 65381791801.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15944729 + ... + 15948828.

Almost surely, 2^65381791850 is an apocalyptic number.

65381791850 is a deficient number, since it is larger than the sum of its proper divisors (59194445698).

65381791850 is a wasteful number, since it uses less digits than its factorization.

65381791850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31893610 (or 31893605 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 65381791850 in words is "sixty-five billion, three hundred eighty-one million, seven hundred ninety-one thousand, eight hundred fifty".