668046577 has 4 divisors (see below), whose sum is σ = 728778096. Its totient is φ = 607315060.

The previous prime is 668046551. The next prime is 668046629. The reversal of 668046577 is 775640866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-668046577 is a prime.

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 668046577.

It is not an unprimeable number, because it can be changed into a prime (668046077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30365743 + ... + 30365764.

It is an arithmetic number, because the mean of its divisors is an integer number (182194524).

Almost surely, 2^668046577 is an apocalyptic number.

It is an amenable number.

668046577 is a deficient number, since it is larger than the sum of its proper divisors (60731519).

668046577 is a wasteful number, since it uses less digits than its factorization.

668046577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60731518.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The square root of 668046577 is about 25846.5970100514. The cubic root of 668046577 is about 874.1827807114.

The spelling of 668046577 in words is "six hundred sixty-eight million, forty-six thousand, five hundred seventy-seven".