401915837681 has 2 divisors, whose sum is σ = 401915837682. Its totient is φ = 401915837680.

The previous prime is 401915837657. The next prime is 401915837689. The reversal of 401915837681 is 186738519104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380318890000 + 21596947681 = 616700^2 + 146959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401915837681 is a prime.

It is a super-2 number, since 2×401915837681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401915837689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200957918840 + 200957918841.

It is an arithmetic number, because the mean of its divisors is an integer number (200957918841).

Almost surely, 2^401915837681 is an apocalyptic number.

It is an amenable number.

401915837681 is a deficient number, since it is larger than the sum of its proper divisors (1).

401915837681 is an equidigital number, since it uses as much as digits as its factorization.

401915837681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 401915837681 in words is "four hundred one billion, nine hundred fifteen million, eight hundred thirty-seven thousand, six hundred eighty-one".