398641045565 has 16 divisors (see below), whose sum is σ = 546812924160. Its totient is φ = 273301257600.

The previous prime is 398641045541. The next prime is 398641045633. The reversal of 398641045565 is 565540146893.

It is not a de Polignac number, because 398641045565 - 2³⁶ = 329921568829 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 398641045565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910961 + ... + 1275590.

It is an arithmetic number, because the mean of its divisors is an integer number (34175807760).

Almost surely, 2^398641045565 is an apocalyptic number.

398641045565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398641045565 is a deficient number, since it is larger than the sum of its proper divisors (148171878595).

398641045565 is a wasteful number, since it uses less digits than its factorization.

398641045565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191772.

The product of its (nonzero) digits is 15552000, while the sum is 56.

The spelling of 398641045565 in words is "three hundred ninety-eight billion, six hundred forty-one million, forty-five thousand, five hundred sixty-five".