671787116605 has 8 divisors (see below), whose sum is σ = 879430407264. Its totient is φ = 488572448400.

The previous prime is 671787116579. The next prime is 671787116639. The reversal of 671787116605 is 506611787176.

671787116605 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 not a de Polignac number, because 671787116605 - 2¹⁵ = 671787083837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 12214311211 = 671787116605 / (6 + 7 + 1 + 7 + 8 + 7 + 1 + 1 + 6 + 6 + 0 + 5).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6107155551 + ... + 6107155660.

It is an arithmetic number, because the mean of its divisors is an integer number (109928800908).

Almost surely, 2^671787116605 is an apocalyptic number.

It is an amenable number.

671787116605 is a deficient number, since it is larger than the sum of its proper divisors (207643290659).

671787116605 is a wasteful number, since it uses less digits than its factorization.

671787116605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12214311227.

The product of its (nonzero) digits is 2963520, while the sum is 55.

The spelling of 671787116605 in words is "six hundred seventy-one billion, seven hundred eighty-seven million, one hundred sixteen thousand, six hundred five".