671765788407 has 8 divisors (see below), whose sum is σ = 1023643106176. Its totient is φ = 383866164792.

The previous prime is 671765788381. The next prime is 671765788411. The reversal of 671765788407 is 704887567176.

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

It is not a de Polignac number, because 671765788407 - 2⁷ = 671765788279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671765788307) 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 7 ways as a sum of consecutive naturals, for example, 15994423513 + ... + 15994423554.

It is an arithmetic number, because the mean of its divisors is an integer number (127955388272).

Almost surely, 2^671765788407 is an apocalyptic number.

671765788407 is a deficient number, since it is larger than the sum of its proper divisors (351877317769).

671765788407 is a wasteful number, since it uses less digits than its factorization.

671765788407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31988847077.

The product of its (nonzero) digits is 110638080, while the sum is 66.

The spelling of 671765788407 in words is "six hundred seventy-one billion, seven hundred sixty-five million, seven hundred eighty-eight thousand, four hundred seven".