400181385589 has 2 divisors, whose sum is σ = 400181385590. Its totient is φ = 400181385588.

The previous prime is 400181385581. The next prime is 400181385601. The reversal of 400181385589 is 985583181004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315242946225 + 84938439364 = 561465^2 + 291442^2 .

It is a cyclic number.

It is not a de Polignac number, because 400181385589 - 2³ = 400181385581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400181385581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200090692794 + 200090692795.

It is an arithmetic number, because the mean of its divisors is an integer number (200090692795).

Almost surely, 2^400181385589 is an apocalyptic number.

It is an amenable number.

400181385589 is a deficient number, since it is larger than the sum of its proper divisors (1).

400181385589 is an equidigital number, since it uses as much as digits as its factorization.

400181385589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 52.

The spelling of 400181385589 in words is "four hundred billion, one hundred eighty-one million, three hundred eighty-five thousand, five hundred eighty-nine".