668031379 has 2 divisors, whose sum is σ = 668031380. Its totient is φ = 668031378.

The previous prime is 668031373. The next prime is 668031391. The reversal of 668031379 is 973130866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668031379 is a prime.

It is not a weakly prime, because it can be changed into another prime (668031373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334015689 + 334015690.

It is an arithmetic number, because the mean of its divisors is an integer number (334015690).

Almost surely, 2^668031379 is an apocalyptic number.

668031379 is a deficient number, since it is larger than the sum of its proper divisors (1).

668031379 is an equidigital number, since it uses as much as digits as its factorization.

668031379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 668031379 is about 25846.3030044918. The cubic root of 668031379 is about 874.1761514677.

The spelling of 668031379 in words is "six hundred sixty-eight million, thirty-one thousand, three hundred seventy-nine".