400181385599 has 4 divisors (see below), whose sum is σ = 400453434240. Its totient is φ = 399909336960.

The previous prime is 400181385589. The next prime is 400181385601. The reversal of 400181385599 is 995583181004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400181385599 - 2⁸ = 400181385343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400181385599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400181385529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136022114 + ... + 136025055.

It is an arithmetic number, because the mean of its divisors is an integer number (100113358560).

Almost surely, 2^400181385599 is an apocalyptic number.

400181385599 is a deficient number, since it is larger than the sum of its proper divisors (272048641).

400181385599 is a wasteful number, since it uses less digits than its factorization.

400181385599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272048640.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 400181385599 in words is "four hundred billion, one hundred eighty-one million, three hundred eighty-five thousand, five hundred ninety-nine".