668078862377 has 4 divisors (see below), whose sum is σ = 672503225856. Its totient is φ = 663654498900.

The previous prime is 668078862361. The next prime is 668078862383. The reversal of 668078862377 is 773268870866.

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: 773268870866 = 2 ⋅386634435433.

It is a cyclic number.

It is not a de Polignac number, because 668078862377 - 2⁴ = 668078862361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668078862337) 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, 2212181513 + ... + 2212181814.

It is an arithmetic number, because the mean of its divisors is an integer number (168125806464).

Almost surely, 2^668078862377 is an apocalyptic number.

It is an amenable number.

668078862377 is a deficient number, since it is larger than the sum of its proper divisors (4424363479).

668078862377 is a wasteful number, since it uses less digits than its factorization.

668078862377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424363478.

The product of its (nonzero) digits is 227598336, while the sum is 68.

The spelling of 668078862377 in words is "six hundred sixty-eight billion, seventy-eight million, eight hundred sixty-two thousand, three hundred seventy-seven".