671620172652 has 72 divisors (see below), whose sum is σ = 1994508406800. Its totient is φ = 187865781120.

The previous prime is 671620172651. The next prime is 671620172653. The reversal of 671620172652 is 256271026176.

671620172652 is a `hidden beast` number, since 6 + 7 + 1 + 620 + 17 + 2 + 6 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (671620172651) and next prime (671620172653).

It is a junction number, because it is equal to n+sod(n) for n = 671620172598 and 671620172607.

It is not an unprimeable number, because it can be changed into a prime (671620172651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65226027 + ... + 65236322.

It is an arithmetic number, because the mean of its divisors is an integer number (27701505650).

Almost surely, 2^671620172652 is an apocalyptic number.

It is an amenable number.

671620172652 is an abundant number, since it is smaller than the sum of its proper divisors (1322888234148).

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

671620172652 is a wasteful number, since it uses less digits than its factorization.

671620172652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130462383 (or 130462378 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 671620172652 in words is "six hundred seventy-one billion, six hundred twenty million, one hundred seventy-two thousand, six hundred fifty-two".