671188138621 has 64 divisors (see below), whose sum is σ = 954693734400. Its totient is φ = 454132546560.

The previous prime is 671188138603. The next prime is 671188138651. The reversal of 671188138621 is 126831881176.

It is not a de Polignac number, because 671188138621 - 2¹³ = 671188130429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671188138651) 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 63 ways as a sum of consecutive naturals, for example, 35505030 + ... + 35523928.

It is an arithmetic number, because the mean of its divisors is an integer number (14917089600).

Almost surely, 2^671188138621 is an apocalyptic number.

It is an amenable number.

671188138621 is a deficient number, since it is larger than the sum of its proper divisors (283505595779).

671188138621 is a wasteful number, since it uses less digits than its factorization.

671188138621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21034.

The product of its digits is 774144, while the sum is 52.

The spelling of 671188138621 in words is "six hundred seventy-one billion, one hundred eighty-eight million, one hundred thirty-eight thousand, six hundred twenty-one".