215402642818 has 16 divisors (see below), whose sum is σ = 352488236256. Its totient is φ = 97907185440.

The previous prime is 215402642789. The next prime is 215402642821. The reversal of 215402642818 is 818246204512.

It is a super-2 number, since 2×215402642818² (a number of 23 digits) contains 22 as substring.

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, 645505 + ... + 920587.

It is an arithmetic number, because the mean of its divisors is an integer number (22030514766).

Almost surely, 2^215402642818 is an apocalyptic number.

215402642818 is a deficient number, since it is larger than the sum of its proper divisors (137085593438).

215402642818 is a wasteful number, since it uses less digits than its factorization.

215402642818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310689.

The product of its (nonzero) digits is 245760, while the sum is 43.

The spelling of 215402642818 in words is "two hundred fifteen billion, four hundred two million, six hundred forty-two thousand, eight hundred eighteen".