671605889979 has 8 divisors (see below), whose sum is σ = 895483218240. Its totient is φ = 447732910856.

The previous prime is 671605889959. The next prime is 671605890031. The reversal of 671605889979 is 979988506176.

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 671605889979 - 2⁵ = 671605889947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671605889979.

It is not an unprimeable number, because it can be changed into a prime (671605889959) 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, 708069 + ... + 1358150.

It is an arithmetic number, because the mean of its divisors is an integer number (111935402280).

Almost surely, 2^671605889979 is an apocalyptic number.

671605889979 is a deficient number, since it is larger than the sum of its proper divisors (223877328261).

671605889979 is a wasteful number, since it uses less digits than its factorization.

671605889979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174569.

The product of its (nonzero) digits is 411505920, while the sum is 75.

The spelling of 671605889979 in words is "six hundred seventy-one billion, six hundred five million, eight hundred eighty-nine thousand, nine hundred seventy-nine".