398181561885655 has 8 divisors (see below), whose sum is σ = 477817981377984. Its totient is φ = 318545178098400.

The previous prime is 398181561885643. The next prime is 398181561885661. The reversal of 398181561885655 is 556588165181893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398181561885655 - 2⁵ = 398181561885623 is a prime.

It is a super-3 number, since 3×398181561885655³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39042210 + ... + 48173200.

It is an arithmetic number, because the mean of its divisors is an integer number (59727247672248).

Almost surely, 2^{398181561885655} is an apocalyptic number.

398181561885655 is a deficient number, since it is larger than the sum of its proper divisors (79636419492329).

398181561885655 is an equidigital number, since it uses as much as digits as its factorization.

398181561885655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17852537.

The product of its digits is 2488320000, while the sum is 79.

The spelling of 398181561885655 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-five".