68213815857 has 24 divisors (see below), whose sum is σ = 107772107040. Its totient is φ = 41232602880.

The previous prime is 68213815853. The next prime is 68213815867. The reversal of 68213815857 is 75851831286.

68213815857 is a `hidden beast` number, since 6 + 8 + 21 + 38 + 1 + 585 + 7 = 666.

It is not a de Polignac number, because 68213815857 - 2² = 68213815853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68213815853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 871488 + ... + 946529.

It is an arithmetic number, because the mean of its divisors is an integer number (4490504460).

Almost surely, 2^68213815857 is an apocalyptic number.

It is an amenable number.

68213815857 is a deficient number, since it is larger than the sum of its proper divisors (39558291183).

68213815857 is a wasteful number, since it uses less digits than its factorization.

68213815857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818413 (or 1818410 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 54.

The spelling of 68213815857 in words is "sixty-eight billion, two hundred thirteen million, eight hundred fifteen thousand, eight hundred fifty-seven".