671664579967 has 8 divisors (see below), whose sum is σ = 672171598880. Its totient is φ = 671157757440.

The previous prime is 671664579923. The next prime is 671664580061. The reversal of 671664579967 is 769975466176.

671664579967 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671664579967 is a prime.

It is a super-2 number, since 2×671664579967² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671664579967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671664571967) 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, 7190659 + ... + 7283467.

It is an arithmetic number, because the mean of its divisors is an integer number (84021449860).

Almost surely, 2^671664579967 is an apocalyptic number.

671664579967 is a deficient number, since it is larger than the sum of its proper divisors (507018913).

671664579967 is a wasteful number, since it uses less digits than its factorization.

671664579967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98193.

The product of its digits is 720135360, while the sum is 73.

The spelling of 671664579967 in words is "six hundred seventy-one billion, six hundred sixty-four million, five hundred seventy-nine thousand, nine hundred sixty-seven".