866255260031 has 4 divisors (see below), whose sum is σ = 990006011472. Its totient is φ = 742504508592.

The previous prime is 866255260027. The next prime is 866255260043. The reversal of 866255260031 is 130062552668.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 866255260031 - 2² = 866255260027 is a prime.

It is a super-2 number, since 2×866255260031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866255260231) 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, 61875375710 + ... + 61875375723.

It is an arithmetic number, because the mean of its divisors is an integer number (247501502868).

Almost surely, 2^866255260031 is an apocalyptic number.

866255260031 is a deficient number, since it is larger than the sum of its proper divisors (123750751441).

866255260031 is a wasteful number, since it uses less digits than its factorization.

866255260031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123750751440.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 866255260031 in words is "eight hundred sixty-six billion, two hundred fifty-five million, two hundred sixty thousand, thirty-one".