394564361953 has 2 divisors, whose sum is σ = 394564361954. Its totient is φ = 394564361952.

The previous prime is 394564361951. The next prime is 394564361977. The reversal of 394564361953 is 359163465493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352565187984 + 41999173969 = 593772^2 + 204937^2 .

It is a cyclic number.

It is not a de Polignac number, because 394564361953 - 2¹ = 394564361951 is a prime.

Together with 394564361951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394564361951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197282180976 + 197282180977.

It is an arithmetic number, because the mean of its divisors is an integer number (197282180977).

Almost surely, 2^394564361953 is an apocalyptic number.

It is an amenable number.

394564361953 is a deficient number, since it is larger than the sum of its proper divisors (1).

394564361953 is an equidigital number, since it uses as much as digits as its factorization.

394564361953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31492800, while the sum is 58.

The spelling of 394564361953 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-one thousand, nine hundred fifty-three".