621131476218 has 16 divisors (see below), whose sum is σ = 1355195948256. Its totient is φ = 188221659440.

The previous prime is 621131476187. The next prime is 621131476249. The reversal of 621131476218 is 812674131126.

It is an interprime number because it is at equal distance from previous prime (621131476187) and next prime (621131476249).

It is a self number, because there is not a number n which added to its sum of digits gives 621131476218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4705541421 + ... + 4705541552.

It is an arithmetic number, because the mean of its divisors is an integer number (84699746766).

Almost surely, 2^621131476218 is an apocalyptic number.

621131476218 is an abundant number, since it is smaller than the sum of its proper divisors (734064472038).

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

621131476218 is a wasteful number, since it uses less digits than its factorization.

621131476218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411082989.

The product of its digits is 96768, while the sum is 42.

The spelling of 621131476218 in words is "six hundred twenty-one billion, one hundred thirty-one million, four hundred seventy-six thousand, two hundred eighteen".