31897666679813 has 8 divisors (see below), whose sum is σ = 34800969218016. Its totient is φ = 28994949918000.

The previous prime is 31897666679803. The next prime is 31897666679821.

31897666679813 is nontrivially palindromic in base 10.

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

It is a de Polignac number, because none of the positive numbers 2^k-31897666679813 is a prime.

It is a super-2 number, since 2×31897666679813² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31897666679803) 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, 146330231 + ... + 146548052.

It is an arithmetic number, because the mean of its divisors is an integer number (4350121152252).

Almost surely, 2^{31897666679813} is an apocalyptic number.

It is an amenable number.

31897666679813 is a deficient number, since it is larger than the sum of its proper divisors (2903302538203).

31897666679813 is a wasteful number, since it uses less digits than its factorization.

31897666679813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292888195.

The product of its digits is 2962842624, while the sum is 80.

The spelling of 31897666679813 in words is "thirty-one trillion, eight hundred ninety-seven billion, six hundred sixty-six million, six hundred seventy-nine thousand, eight hundred thirteen".