671639651999 has 8 divisors (see below), whose sum is σ = 689837529600. Its totient is φ = 653444166816.

The previous prime is 671639651989. The next prime is 671639652001. The reversal of 671639651999 is 999156936176.

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

It is a cyclic number.

It is not a de Polignac number, because 671639651999 - 2⁴ = 671639651983 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 (671639651989) 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, 21599 + ... + 1159200.

It is an arithmetic number, because the mean of its divisors is an integer number (86229691200).

Almost surely, 2^671639651999 is an apocalyptic number.

671639651999 is a deficient number, since it is larger than the sum of its proper divisors (18197877601).

671639651999 is a wasteful number, since it uses less digits than its factorization.

671639651999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196209.

The product of its digits is 148803480, while the sum is 71.

The spelling of 671639651999 in words is "six hundred seventy-one billion, six hundred thirty-nine million, six hundred fifty-one thousand, nine hundred ninety-nine".