394161767977 has 2 divisors, whose sum is σ = 394161767978. Its totient is φ = 394161767976.

The previous prime is 394161767963. The next prime is 394161768037. The reversal of 394161767977 is 779767161493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304862996736 + 89298771241 = 552144^2 + 298829^2 .

It is a cyclic number.

It is not a de Polignac number, because 394161767977 - 2⁷ = 394161767849 is a prime.

It is not a weakly prime, because it can be changed into another prime (394161767177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197080883988 + 197080883989.

It is an arithmetic number, because the mean of its divisors is an integer number (197080883989).

Almost surely, 2^394161767977 is an apocalyptic number.

It is an amenable number.

394161767977 is a deficient number, since it is larger than the sum of its proper divisors (1).

394161767977 is an equidigital number, since it uses as much as digits as its factorization.

394161767977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84015792, while the sum is 67.

The spelling of 394161767977 in words is "three hundred ninety-four billion, one hundred sixty-one million, seven hundred sixty-seven thousand, nine hundred seventy-seven".