668139754 has 8 divisors (see below), whose sum is σ = 1002348000. Its totient is φ = 334023756.

The previous prime is 668139737. The next prime is 668139793. The reversal of 668139754 is 457931866.

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

It is a junction number, because it is equal to n+sod(n) for n = 668139698 and 668139707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564 + ... + 36559.

It is an arithmetic number, because the mean of its divisors is an integer number (125293500).

Almost surely, 2^668139754 is an apocalyptic number.

668139754 is a deficient number, since it is larger than the sum of its proper divisors (334208246).

668139754 is a wasteful number, since it uses less digits than its factorization.

668139754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46124.

The product of its digits is 1088640, while the sum is 49.

The square root of 668139754 is about 25848.3994475480. The cubic root of 668139754 is about 874.2234215614.

It can be divided in two parts, 66813 and 9754, that added together give a palindrome (76567).

The spelling of 668139754 in words is "six hundred sixty-eight million, one hundred thirty-nine thousand, seven hundred fifty-four".