215704540785 has 32 divisors (see below), whose sum is σ = 360212272128. Its totient is φ = 110016294080.

The previous prime is 215704540781. The next prime is 215704540859. The reversal of 215704540785 is 587045407512.

It is not a de Polignac number, because 215704540785 - 2² = 215704540781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215704540781) 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, 1551754 + ... + 1685036.

It is an arithmetic number, because the mean of its divisors is an integer number (11256633504).

Almost surely, 2^215704540785 is an apocalyptic number.

It is an amenable number.

215704540785 is a deficient number, since it is larger than the sum of its proper divisors (144507731343).

215704540785 is a wasteful number, since it uses less digits than its factorization.

215704540785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138005.

The product of its (nonzero) digits is 1568000, while the sum is 48.

The spelling of 215704540785 in words is "two hundred fifteen billion, seven hundred four million, five hundred forty thousand, seven hundred eighty-five".