866157857622057 has 64 divisors (see below), whose sum is σ = 1571845431453696. Its totient is φ = 409650836175360.

The previous prime is 866157857621981. The next prime is 866157857622059. The reversal of 866157857622057 is 750226758751668.

It is not a de Polignac number, because 866157857622057 - 2¹⁵ = 866157857589289 is a prime.

It is a super-2 number, since 2×866157857622057² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866157857622057.

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 63 ways as a sum of consecutive naturals, for example, 1975334583 + ... + 1975773020.

It is an arithmetic number, because the mean of its divisors is an integer number (24560084866464).

Almost surely, 2^{866157857622057} is an apocalyptic number.

It is an amenable number.

866157857622057 is a deficient number, since it is larger than the sum of its proper divisors (705687573831639).

866157857622057 is a wasteful number, since it uses less digits than its factorization.

866157857622057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951107710.

The product of its (nonzero) digits is 2370816000, while the sum is 75.

The spelling of 866157857622057 in words is "eight hundred sixty-six trillion, one hundred fifty-seven billion, eight hundred fifty-seven million, six hundred twenty-two thousand, fifty-seven".