668962919 has 8 divisors (see below), whose sum is σ = 693118080. Its totient is φ = 644968800.

The previous prime is 668962913. The next prime is 668962927. The reversal of 668962919 is 919269866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668962919 is a prime.

It is a super-2 number, since 2×668962919² = 895022773994001122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668962913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31772 + ... + 48449.

It is an arithmetic number, because the mean of its divisors is an integer number (86639760).

Almost surely, 2^668962919 is an apocalyptic number.

668962919 is a deficient number, since it is larger than the sum of its proper divisors (24155161).

668962919 is a wasteful number, since it uses less digits than its factorization.

668962919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80521.

The product of its digits is 2519424, while the sum is 56.

The square root of 668962919 is about 25864.3174856790. The cubic root of 668962919 is about 874.5822959768.

The spelling of 668962919 in words is "six hundred sixty-eight million, nine hundred sixty-two thousand, nine hundred nineteen".