215040638765 has 16 divisors (see below), whose sum is σ = 258805650432. Its totient is φ = 171528119424.

The previous prime is 215040638759. The next prime is 215040638833. The reversal of 215040638765 is 567836040512.

It is not a de Polignac number, because 215040638765 - 2¹⁰ = 215040637741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12114977 + ... + 12132713.

It is an arithmetic number, because the mean of its divisors is an integer number (16175353152).

Almost surely, 2^215040638765 is an apocalyptic number.

It is an amenable number.

215040638765 is a deficient number, since it is larger than the sum of its proper divisors (43765011667).

215040638765 is a wasteful number, since it uses less digits than its factorization.

215040638765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24716.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 215040638765 in words is "two hundred fifteen billion, forty million, six hundred thirty-eight thousand, seven hundred sixty-five".