856637169544001 has 4 divisors (see below), whose sum is σ = 861422852055600. Its totient is φ = 851851487032404.

The previous prime is 856637169543917. The next prime is 856637169544099. The reversal of 856637169544001 is 100445961736658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856637169544001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856637169544801) 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, 2392841255531 + ... + 2392841255888.

It is an arithmetic number, because the mean of its divisors is an integer number (215355713013900).

Almost surely, 2^{856637169544001} is an apocalyptic number.

It is an amenable number.

856637169544001 is a deficient number, since it is larger than the sum of its proper divisors (4785682511599).

856637169544001 is a wasteful number, since it uses less digits than its factorization.

856637169544001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785682511598.

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 856637169544001 in words is "eight hundred fifty-six trillion, six hundred thirty-seven billion, one hundred sixty-nine million, five hundred forty-four thousand, one".