401995899457 has 2 divisors, whose sum is σ = 401995899458. Its totient is φ = 401995899456.

The previous prime is 401995899433. The next prime is 401995899511. The reversal of 401995899457 is 754998599104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362932748721 + 39063150736 = 602439^2 + 197644^2 .

It is a cyclic number.

It is not a de Polignac number, because 401995899457 - 2⁷ = 401995899329 is a prime.

It is not a weakly prime, because it can be changed into another prime (401995899427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200997949728 + 200997949729.

It is an arithmetic number, because the mean of its divisors is an integer number (200997949729).

Almost surely, 2^401995899457 is an apocalyptic number.

It is an amenable number.

401995899457 is a deficient number, since it is larger than the sum of its proper divisors (1).

401995899457 is an equidigital number, since it uses as much as digits as its factorization.

401995899457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 146966400, while the sum is 70.

The spelling of 401995899457 in words is "four hundred one billion, nine hundred ninety-five million, eight hundred ninety-nine thousand, four hundred fifty-seven".