318687657121 has 8 divisors (see below), whose sum is σ = 323445391488. Its totient is φ = 313937400000.

The previous prime is 318687657091. The next prime is 318687657131. The reversal of 318687657121 is 121756786813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318687657121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318687657131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1783405 + ... + 1953946.

It is an arithmetic number, because the mean of its divisors is an integer number (40430673936).

Almost surely, 2^318687657121 is an apocalyptic number.

It is an amenable number.

318687657121 is a deficient number, since it is larger than the sum of its proper divisors (4757734367).

318687657121 is a wasteful number, since it uses less digits than its factorization.

318687657121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738623.

The product of its digits is 3386880, while the sum is 55.

The spelling of 318687657121 in words is "three hundred eighteen billion, six hundred eighty-seven million, six hundred fifty-seven thousand, one hundred twenty-one".