631861799377 has 2 divisors, whose sum is σ = 631861799378. Its totient is φ = 631861799376.

The previous prime is 631861799369. The next prime is 631861799383. The reversal of 631861799377 is 773997168136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628779217936 + 3082581441 = 792956^2 + 55521^2 .

It is a cyclic number.

It is not a de Polignac number, because 631861799377 - 2³ = 631861799369 is a prime.

It is not a weakly prime, because it can be changed into another prime (631861799977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315930899688 + 315930899689.

It is an arithmetic number, because the mean of its divisors is an integer number (315930899689).

Almost surely, 2^631861799377 is an apocalyptic number.

It is an amenable number.

631861799377 is a deficient number, since it is larger than the sum of its proper divisors (1).

631861799377 is an equidigital number, since it uses as much as digits as its factorization.

631861799377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72013536, while the sum is 67.

The spelling of 631861799377 in words is "six hundred thirty-one billion, eight hundred sixty-one million, seven hundred ninety-nine thousand, three hundred seventy-seven".