398181561885654 has 64 divisors (see below), whose sum is σ = 807838140948480. Its totient is φ = 130815890352000.

The previous prime is 398181561885643. The next prime is 398181561885661. The reversal of 398181561885654 is 456588165181893.

It is a super-3 number, since 3×398181561885654³ (a number of 45 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398181561885654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31037608512 + ... + 31037621340.

It is an arithmetic number, because the mean of its divisors is an integer number (12622470952320).

Almost surely, 2^{398181561885654} is an apocalyptic number.

398181561885654 is an abundant number, since it is smaller than the sum of its proper divisors (409656579062826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398181561885654 is a wasteful number, since it uses less digits than its factorization.

398181561885654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30557.

The product of its digits is 1990656000, while the sum is 78.

The spelling of 398181561885654 in words is "three hundred ninety-eight trillion, one hundred eighty-one billion, five hundred sixty-one million, eight hundred eighty-five thousand, six hundred fifty-four".