215715611251 has 16 divisors (see below), whose sum is σ = 261406491840. Its totient is φ = 173774361600.

The previous prime is 215715611239. The next prime is 215715611261. The reversal of 215715611251 is 152116517512.

It is not a de Polignac number, because 215715611251 - 2¹¹ = 215715609203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215715611251.

It is not an unprimeable number, because it can be changed into a prime (215715611261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1209546 + ... + 1376383.

It is an arithmetic number, because the mean of its divisors is an integer number (16337905740).

Almost surely, 2^215715611251 is an apocalyptic number.

215715611251 is a deficient number, since it is larger than the sum of its proper divisors (45690880589).

215715611251 is a wasteful number, since it uses less digits than its factorization.

215715611251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586654.

The product of its digits is 21000, while the sum is 37.

The spelling of 215715611251 in words is "two hundred fifteen billion, seven hundred fifteen million, six hundred eleven thousand, two hundred fifty-one".