401905204957 has 2 divisors, whose sum is σ = 401905204958. Its totient is φ = 401905204956.

The previous prime is 401905204907. The next prime is 401905205021. The reversal of 401905204957 is 759402509104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345625234201 + 56279970756 = 587899^2 + 237234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401905204957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401905204907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200952602478 + 200952602479.

It is an arithmetic number, because the mean of its divisors is an integer number (200952602479).

Almost surely, 2^401905204957 is an apocalyptic number.

It is an amenable number.

401905204957 is a deficient number, since it is larger than the sum of its proper divisors (1).

401905204957 is an equidigital number, since it uses as much as digits as its factorization.

401905204957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 401905204957 in words is "four hundred one billion, nine hundred five million, two hundred four thousand, nine hundred fifty-seven".