215720053753111 has 24 divisors (see below), whose sum is σ = 220835020488192. Its totient is φ = 210710119729200.

The previous prime is 215720053753073. The next prime is 215720053753123. The reversal of 215720053753111 is 111357350027512.

It is a happy number.

It is not a de Polignac number, because 215720053753111 - 2²³ = 215720045364503 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 (215720053753411) 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, 400576116 + ... + 401114278.

It is an arithmetic number, because the mean of its divisors is an integer number (9201459187008).

Almost surely, 2^{215720053753111} is an apocalyptic number.

215720053753111 is a deficient number, since it is larger than the sum of its proper divisors (5114966735081).

215720053753111 is an equidigital number, since it uses as much as digits as its factorization.

215720053753111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539043 (or 538972 counting only the distinct ones).

The product of its (nonzero) digits is 220500, while the sum is 43.

The spelling of 215720053753111 in words is "two hundred fifteen trillion, seven hundred twenty billion, fifty-three million, seven hundred fifty-three thousand, one hundred eleven".