668793562 has 4 divisors (see below), whose sum is σ = 1003190346. Its totient is φ = 334396780.

The previous prime is 668793553. The next prime is 668793571. The reversal of 668793562 is 265397866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 265397866 = 2 ⋅132698933.

It is an interprime number because it is at equal distance from previous prime (668793553) and next prime (668793571).

It can be written as a sum of positive squares in only one way, i.e., 665072521 + 3721041 = 25789^2 + 1929^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167198389 + ... + 167198392.

Almost surely, 2^668793562 is an apocalyptic number.

668793562 is a deficient number, since it is larger than the sum of its proper divisors (334396784).

668793562 is a wasteful number, since it uses less digits than its factorization.

668793562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334396783.

The product of its digits is 3265920, while the sum is 52.

The square root of 668793562 is about 25861.0433277546. The cubic root of 668793562 is about 874.5084856401.

The spelling of 668793562 in words is "six hundred sixty-eight million, seven hundred ninety-three thousand, five hundred sixty-two".