6399461377 has 2 divisors, whose sum is σ = 6399461378. Its totient is φ = 6399461376.

The previous prime is 6399461363. The next prime is 6399461461. The reversal of 6399461377 is 7731649936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5373476416 + 1025984961 = 73304^2 + 32031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6399461377 is a prime.

It is a super-2 number, since 2×6399461377² = 81906211831429472258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6399461777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199730688 + 3199730689.

It is an arithmetic number, because the mean of its divisors is an integer number (3199730689).

Almost surely, 2^6399461377 is an apocalyptic number.

It is an amenable number.

6399461377 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399461377 is an equidigital number, since it uses as much as digits as its factorization.

6399461377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 55.

The square root of 6399461377 is about 79996.6335354182. The cubic root of 6399461377 is about 1856.5834472651.

The spelling of 6399461377 in words is "six billion, three hundred ninety-nine million, four hundred sixty-one thousand, three hundred seventy-seven".