394564361961 has 16 divisors (see below), whose sum is σ = 655899199488. Its totient is φ = 204968499600.

The previous prime is 394564361953. The next prime is 394564361977. The reversal of 394564361961 is 169163465493.

It is not a de Polignac number, because 394564361961 - 2³ = 394564361953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394564361951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 854035185 + ... + 854035646.

It is an arithmetic number, because the mean of its divisors is an integer number (40993699968).

Almost surely, 2^394564361961 is an apocalyptic number.

It is an amenable number.

394564361961 is a deficient number, since it is larger than the sum of its proper divisors (261334837527).

394564361961 is a wasteful number, since it uses less digits than its factorization.

394564361961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708070852.

The product of its digits is 12597120, while the sum is 57.

The spelling of 394564361961 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-one thousand, nine hundred sixty-one".