215138336815 has 8 divisors (see below), whose sum is σ = 259323700608. Its totient is φ = 171338871840.

The previous prime is 215138336761. The next prime is 215138336863. The reversal of 215138336815 is 518633831512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215138336815 - 2²¹ = 215136239663 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 7 ways as a sum of consecutive naturals, for example, 96473476 + ... + 96475705.

It is an arithmetic number, because the mean of its divisors is an integer number (32415462576).

Almost surely, 2^215138336815 is an apocalyptic number.

215138336815 is a deficient number, since it is larger than the sum of its proper divisors (44185363793).

215138336815 is a wasteful number, since it uses less digits than its factorization.

215138336815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192949409.

The product of its digits is 518400, while the sum is 46.

The spelling of 215138336815 in words is "two hundred fifteen billion, one hundred thirty-eight million, three hundred thirty-six thousand, eight hundred fifteen".