215364864856 has 16 divisors (see below), whose sum is σ = 409836124440. Its totient is φ = 106075231680.

The previous prime is 215364864829. The next prime is 215364864859. The reversal of 215364864856 is 658468463512.

It is a super-3 number, since 3×215364864856³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215364864856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215364864859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200899525 + ... + 200900596.

Almost surely, 2^215364864856 is an apocalyptic number.

It is an amenable number.

215364864856 is a deficient number, since it is larger than the sum of its proper divisors (194471259584).

215364864856 is a wasteful number, since it uses less digits than its factorization.

215364864856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401800194 (or 401800190 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 58.

The spelling of 215364864856 in words is "two hundred fifteen billion, three hundred sixty-four million, eight hundred sixty-four thousand, eight hundred fifty-six".