668177386 has 4 divisors (see below), whose sum is σ = 1002266082. Its totient is φ = 334088692.

The previous prime is 668177383. The next prime is 668177407. The reversal of 668177386 is 683771866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 683771866 = 2 ⋅341885933.

It can be written as a sum of positive squares in only one way, i.e., 595604025 + 72573361 = 24405^2 + 8519^2 .

It is a super-2 number, since 2×668177386² = 892922038323585992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668177383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167044345 + ... + 167044348.

Almost surely, 2^668177386 is an apocalyptic number.

668177386 is a deficient number, since it is larger than the sum of its proper divisors (334088696).

668177386 is a wasteful number, since it uses less digits than its factorization.

668177386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334088695.

The product of its digits is 2032128, while the sum is 52.

The square root of 668177386 is about 25849.1273740527. The cubic root of 668177386 is about 874.2398343742.

The spelling of 668177386 in words is "six hundred sixty-eight million, one hundred seventy-seven thousand, three hundred eighty-six".