621777161602331 has 12 divisors (see below), whose sum is σ = 725617497355920. Its totient is φ = 531238181236560.

The previous prime is 621777161602231. The next prime is 621777161602351. The reversal of 621777161602331 is 133206161777126.

It is not a de Polignac number, because 621777161602331 - 2³⁸ = 621502283695387 is a prime.

It is a super-2 number, since 2×621777161602331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621777161602351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20400836576 + ... + 20400867053.

It is an arithmetic number, because the mean of its divisors is an integer number (60468124779660).

Almost surely, 2^{621777161602331} is an apocalyptic number.

621777161602331 is a deficient number, since it is larger than the sum of its proper divisors (103840335753589).

621777161602331 is a wasteful number, since it uses less digits than its factorization.

621777161602331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40801703954 (or 40801703947 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 53.

The spelling of 621777161602331 in words is "six hundred twenty-one trillion, seven hundred seventy-seven billion, one hundred sixty-one million, six hundred two thousand, three hundred thirty-one".