671610371781 has 32 divisors (see below), whose sum is σ = 948083761152. Its totient is φ = 422014651520.

The previous prime is 671610371777. The next prime is 671610371797. The reversal of 671610371781 is 187173016176.

It is a cyclic number.

It is not a de Polignac number, because 671610371781 - 2² = 671610371777 is a prime.

It is a super-2 number, since 2×671610371781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 671610371781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671610371711) 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 31 ways as a sum of consecutive naturals, for example, 9335956 + ... + 9407618.

It is an arithmetic number, because the mean of its divisors is an integer number (29627617536).

Almost surely, 2^671610371781 is an apocalyptic number.

It is an amenable number.

671610371781 is a deficient number, since it is larger than the sum of its proper divisors (276473389371).

671610371781 is a wasteful number, since it uses less digits than its factorization.

671610371781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73673.

The product of its (nonzero) digits is 296352, while the sum is 48.

The spelling of 671610371781 in words is "six hundred seventy-one billion, six hundred ten million, three hundred seventy-one thousand, seven hundred eighty-one".