215211634651 has 16 divisors (see below), whose sum is σ = 234673893664. Its totient is φ = 196180268544.

The previous prime is 215211634643. The next prime is 215211634681. The reversal of 215211634651 is 156436112512.

It is not a de Polignac number, because 215211634651 - 2³ = 215211634643 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 215211634651.

It is not an unprimeable number, because it can be changed into a prime (215211634601) 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, 9235 + ... + 656131.

It is an arithmetic number, because the mean of its divisors is an integer number (14667118354).

Almost surely, 2^215211634651 is an apocalyptic number.

215211634651 is a deficient number, since it is larger than the sum of its proper divisors (19462259013).

215211634651 is a wasteful number, since it uses less digits than its factorization.

215211634651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647230.

The product of its digits is 43200, while the sum is 37.

The spelling of 215211634651 in words is "two hundred fifteen billion, two hundred eleven million, six hundred thirty-four thousand, six hundred fifty-one".