400602399961 has 2 divisors, whose sum is σ = 400602399962. Its totient is φ = 400602399960.

The previous prime is 400602399947. The next prime is 400602400007. The reversal of 400602399961 is 169993206004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207370944400 + 193231455561 = 455380^2 + 439581^2 .

It is a cyclic number.

It is not a de Polignac number, because 400602399961 - 2³⁷ = 263163446489 is a prime.

It is not a weakly prime, because it can be changed into another prime (400602399161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200301199980 + 200301199981.

It is an arithmetic number, because the mean of its divisors is an integer number (200301199981).

Almost surely, 2^400602399961 is an apocalyptic number.

It is an amenable number.

400602399961 is a deficient number, since it is larger than the sum of its proper divisors (1).

400602399961 is an equidigital number, since it uses as much as digits as its factorization.

400602399961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 49.

The spelling of 400602399961 in words is "four hundred billion, six hundred two million, three hundred ninety-nine thousand, nine hundred sixty-one".