394564361977 has 2 divisors, whose sum is σ = 394564361978. Its totient is φ = 394564361976.

The previous prime is 394564361953. The next prime is 394564362013. The reversal of 394564361977 is 779163465493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266900357376 + 127664004601 = 516624^2 + 357301^2 .

It is a cyclic number.

It is not a de Polignac number, because 394564361977 - 2¹¹ = 394564359929 is a prime.

It is not a weakly prime, because it can be changed into another prime (394564368977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197282180988 + 197282180989.

It is an arithmetic number, because the mean of its divisors is an integer number (197282180989).

Almost surely, 2^394564361977 is an apocalyptic number.

It is an amenable number.

394564361977 is a deficient number, since it is larger than the sum of its proper divisors (1).

394564361977 is an equidigital number, since it uses as much as digits as its factorization.

394564361977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102876480, while the sum is 64.

The spelling of 394564361977 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-one thousand, nine hundred seventy-seven".