408763161581 has 2 divisors, whose sum is σ = 408763161582. Its totient is φ = 408763161580.

The previous prime is 408763161563. The next prime is 408763161601. The reversal of 408763161581 is 185161367804.

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., 391198960681 + 17564200900 = 625459^2 + 132530^2 .

It is a cyclic number.

It is not a de Polignac number, because 408763161581 - 2¹⁸ = 408762899437 is a prime.

It is a super-2 number, since 2×408763161581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408763161511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204381580790 + 204381580791.

It is an arithmetic number, because the mean of its divisors is an integer number (204381580791).

Almost surely, 2^408763161581 is an apocalyptic number.

It is an amenable number.

408763161581 is a deficient number, since it is larger than the sum of its proper divisors (1).

408763161581 is an equidigital number, since it uses as much as digits as its factorization.

408763161581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 408763161581 in words is "four hundred eight billion, seven hundred sixty-three million, one hundred sixty-one thousand, five hundred eighty-one".