668798831 has 4 divisors (see below), whose sum is σ = 668912952. Its totient is φ = 668684712.

The previous prime is 668798789. The next prime is 668798833. The reversal of 668798831 is 138897866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668798831 is a prime.

It is a super-2 number, since 2×668798831² = 894583752693933122, 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 (668798833) 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, 47765 + ... + 60158.

It is an arithmetic number, because the mean of its divisors is an integer number (167228238).

Almost surely, 2^668798831 is an apocalyptic number.

668798831 is a deficient number, since it is larger than the sum of its proper divisors (114121).

668798831 is a wasteful number, since it uses less digits than its factorization.

668798831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114120.

The product of its digits is 3483648, while the sum is 56.

The square root of 668798831 is about 25861.1451989273. The cubic root of 668798831 is about 874.5107821998.

The spelling of 668798831 in words is "six hundred sixty-eight million, seven hundred ninety-eight thousand, eight hundred thirty-one".