215440638069 has 32 divisors (see below), whose sum is σ = 309848232960. Its totient is φ = 132705993600.

The previous prime is 215440638043. The next prime is 215440638089. The reversal of 215440638069 is 960836044512.

It is not a de Polignac number, because 215440638069 - 2¹⁹ = 215440113781 is a prime.

It is a super-2 number, since 2×215440638069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215440638029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8145264 + ... + 8171670.

It is an arithmetic number, because the mean of its divisors is an integer number (9682757280).

Almost surely, 2^215440638069 is an apocalyptic number.

It is an amenable number.

215440638069 is a deficient number, since it is larger than the sum of its proper divisors (94407594891).

215440638069 is a wasteful number, since it uses less digits than its factorization.

215440638069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29961.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 215440638069 in words is "two hundred fifteen billion, four hundred forty million, six hundred thirty-eight thousand, sixty-nine".