400999983617 has 2 divisors, whose sum is σ = 400999983618. Its totient is φ = 400999983616.

The previous prime is 400999983607. The next prime is 400999983667. The reversal of 400999983617 is 716389999004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339890166001 + 61109817616 = 583001^2 + 247204^2 .

It is a cyclic number.

It is not a de Polignac number, because 400999983617 - 2²⁰ = 400998935041 is a prime.

It is not a weakly prime, because it can be changed into another prime (400999983607) 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, 200499991808 + 200499991809.

It is an arithmetic number, because the mean of its divisors is an integer number (200499991809).

Almost surely, 2^400999983617 is an apocalyptic number.

It is an amenable number.

400999983617 is a deficient number, since it is larger than the sum of its proper divisors (1).

400999983617 is an equidigital number, since it uses as much as digits as its factorization.

400999983617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 65.

The spelling of 400999983617 in words is "four hundred billion, nine hundred ninety-nine million, nine hundred eighty-three thousand, six hundred seventeen".