215120344653 has 12 divisors (see below), whose sum is σ = 319127478748. Its totient is φ = 139537520640.

The previous prime is 215120344633. The next prime is 215120344669. The reversal of 215120344653 is 356443021512.

215120344653 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 203 + 446 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 176485690404 + 38634654249 = 420102^2 + 196557^2 .

It is not a de Polignac number, because 215120344653 - 2¹⁰ = 215120343629 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 (215120344633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 323003188 + ... + 323003853.

Almost surely, 2^215120344653 is an apocalyptic number.

It is an amenable number.

215120344653 is a deficient number, since it is larger than the sum of its proper divisors (104007134095).

215120344653 is a wasteful number, since it uses less digits than its factorization.

215120344653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646007084 (or 646007081 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 215120344653 in words is "two hundred fifteen billion, one hundred twenty million, three hundred forty-four thousand, six hundred fifty-three".