866157857622056 has 32 divisors (see below), whose sum is σ = 1663659963803880. Its totient is φ = 422515240012800.

The previous prime is 866157857621981. The next prime is 866157857622059. The reversal of 866157857622056 is 650226758751668.

It can be written as a sum of positive squares in 4 ways, for example, as 245193820899556 + 620964036722500 = 15658666^2 + 24919150^2 .

It is not an unprimeable number, because it can be changed into a prime (866157857622059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198650486 + ... + 202963866.

Almost surely, 2^{866157857622056} is an apocalyptic number.

It is an amenable number.

866157857622056 is a deficient number, since it is larger than the sum of its proper divisors (797502106181824).

866157857622056 is a wasteful number, since it uses less digits than its factorization.

866157857622056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4925645 (or 4925641 counting only the distinct ones).

The product of its (nonzero) digits is 2032128000, while the sum is 74.

The spelling of 866157857622056 in words is "eight hundred sixty-six trillion, one hundred fifty-seven billion, eight hundred fifty-seven million, six hundred twenty-two thousand, fifty-six".