68218162157 has 4 divisors (see below), whose sum is σ = 68219498556. Its totient is φ = 68216825760.

The previous prime is 68218162091. The next prime is 68218162213. The reversal of 68218162157 is 75126181286.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26001885001 + 42216277156 = 161251^2 + 205466^2 .

It is a cyclic number.

It is not a de Polignac number, because 68218162157 - 2²⁸ = 67949726701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68218162057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588458 + ... + 694779.

It is an arithmetic number, because the mean of its divisors is an integer number (17054874639).

Almost surely, 2^68218162157 is an apocalyptic number.

It is an amenable number.

68218162157 is a deficient number, since it is larger than the sum of its proper divisors (1336399).

68218162157 is a wasteful number, since it uses less digits than its factorization.

68218162157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336398.

The product of its digits is 322560, while the sum is 47.

The spelling of 68218162157 in words is "sixty-eight billion, two hundred eighteen million, one hundred sixty-two thousand, one hundred fifty-seven".