215720053753131 has 6 divisors (see below), whose sum is σ = 311595633198980. Its totient is φ = 143813369168748.

The previous prime is 215720053753123. The next prime is 215720053753201. The reversal of 215720053753131 is 131357350027512.

215720053753131 is a `hidden beast` number, since 2 + 1 + 57 + 2 + 0 + 0 + 5 + 37 + 531 + 31 = 666.

It is not a de Polignac number, because 215720053753131 - 2³ = 215720053753123 is a prime.

It is a super-2 number, since 2×215720053753131² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215720053703131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11984447430721 + ... + 11984447430738.

Almost surely, 2^{215720053753131} is an apocalyptic number.

215720053753131 is a deficient number, since it is larger than the sum of its proper divisors (95875579445849).

215720053753131 is a wasteful number, since it uses less digits than its factorization.

215720053753131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23968894861465 (or 23968894861462 counting only the distinct ones).

The product of its (nonzero) digits is 661500, while the sum is 45.

The spelling of 215720053753131 in words is "two hundred fifteen trillion, seven hundred twenty billion, fifty-three million, seven hundred fifty-three thousand, one hundred thirty-one".