664916177 has 4 divisors (see below), whose sum is σ = 693825600. Its totient is φ = 636006756.

The previous prime is 664916171. The next prime is 664916221. The reversal of 664916177 is 771619466.

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, and also an emirpimes, since its reverse is a distinct semiprime: 771619466 = 2 ⋅385809733.

It is a cyclic number.

It is not a de Polignac number, because 664916177 - 2¹² = 664912081 is a prime.

It is a super-2 number, since 2×664916177² = 884227044872590658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664916171) 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, 14454677 + ... + 14454722.

It is an arithmetic number, because the mean of its divisors is an integer number (173456400).

Almost surely, 2^664916177 is an apocalyptic number.

It is an amenable number.

664916177 is a deficient number, since it is larger than the sum of its proper divisors (28909423).

664916177 is a wasteful number, since it uses less digits than its factorization.

664916177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28909422.

The product of its digits is 381024, while the sum is 47.

The square root of 664916177 is about 25785.9686069769. The cubic root of 664916177 is about 872.8151977607.

The spelling of 664916177 in words is "six hundred sixty-four million, nine hundred sixteen thousand, one hundred seventy-seven".