215290051965 has 24 divisors (see below), whose sum is σ = 374186262528. Its totient is φ = 114508487520.

The previous prime is 215290051927. The next prime is 215290051979. The reversal of 215290051965 is 569150092512.

215290051965 is a `hidden beast` number, since 21 + 52 + 9 + 0 + 0 + 519 + 65 = 666.

215290051965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215290051965 - 2⁸ = 215290051709 is a prime.

It is a super-2 number, since 2×215290051965² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215290051965.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6501501 + ... + 6534530.

It is an arithmetic number, because the mean of its divisors is an integer number (15591094272).

Almost surely, 2^215290051965 is an apocalyptic number.

It is an amenable number.

215290051965 is a deficient number, since it is larger than the sum of its proper divisors (158896210563).

215290051965 is a wasteful number, since it uses less digits than its factorization.

215290051965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13036409 (or 13036406 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 215290051965 in words is "two hundred fifteen billion, two hundred ninety million, fifty-one thousand, nine hundred sixty-five".