671940431961 has 8 divisors (see below), whose sum is σ = 902975069184. Its totient is φ = 444433041360.

The previous prime is 671940431951. The next prime is 671940431969. The reversal of 671940431961 is 169134049176.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 671940431961 - 2²⁶ = 671873323097 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (671940431969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881811210 + ... + 881811971.

It is an arithmetic number, because the mean of its divisors is an integer number (112871883648).

Almost surely, 2^671940431961 is an apocalyptic number.

It is an amenable number.

671940431961 is a deficient number, since it is larger than the sum of its proper divisors (231034637223).

671940431961 is a wasteful number, since it uses less digits than its factorization.

671940431961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763623311.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 671940431961 in words is "six hundred seventy-one billion, nine hundred forty million, four hundred thirty-one thousand, nine hundred sixty-one".