671890807765251 has 6 divisors (see below), whose sum is σ = 970508944549820. Its totient is φ = 447927205176828.

The previous prime is 671890807765249. The next prime is 671890807765277. The reversal of 671890807765251 is 152567708098176.

671890807765251 is a `hidden beast` number, since 6 + 7 + 1 + 8 + 90 + 8 + 0 + 7 + 7 + 6 + 525 + 1 = 666.

It is not a de Polignac number, because 671890807765251 - 2¹ = 671890807765249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671890807765251.

It is not an unprimeable number, because it can be changed into a prime (671890807765211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37327267098061 + ... + 37327267098078.

Almost surely, 2^{671890807765251} is an apocalyptic number.

671890807765251 is a deficient number, since it is larger than the sum of its proper divisors (298618136784569).

671890807765251 is a wasteful number, since it uses less digits than its factorization.

671890807765251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74654534196145 (or 74654534196142 counting only the distinct ones).

The product of its (nonzero) digits is 355622400, while the sum is 72.

The spelling of 671890807765251 in words is "six hundred seventy-one trillion, eight hundred ninety billion, eight hundred seven million, seven hundred sixty-five thousand, two hundred fifty-one".