668326615 has 16 divisors (see below), whose sum is σ = 920949120. Its totient is φ = 460473120.

The previous prime is 668326591. The next prime is 668326639. The reversal of 668326615 is 516623866.

It is an interprime number because it is at equal distance from previous prime (668326591) and next prime (668326639).

It is not a de Polignac number, because 668326615 - 2⁵ = 668326583 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318729 + ... + 320818.

It is an arithmetic number, because the mean of its divisors is an integer number (57559320).

Almost surely, 2^668326615 is an apocalyptic number.

668326615 is a deficient number, since it is larger than the sum of its proper divisors (252622505).

668326615 is a wasteful number, since it uses less digits than its factorization.

668326615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639582.

The product of its digits is 311040, while the sum is 43.

The square root of 668326615 is about 25852.0137513502. The cubic root of 668326615 is about 874.3049130135.

The spelling of 668326615 in words is "six hundred sixty-eight million, three hundred twenty-six thousand, six hundred fifteen".