668151960 has 128 divisors (see below), whose sum is σ = 2300659200. Its totient is φ = 152064000.

The previous prime is 668151947. The next prime is 668151983. The reversal of 668151960 is 69151866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209256 + ... + 212424.

It is an arithmetic number, because the mean of its divisors is an integer number (17973900).

Almost surely, 2^668151960 is an apocalyptic number.

668151960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668151960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150329600).

668151960 is an abundant number, since it is smaller than the sum of its proper divisors (1632507240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668151960 is a wasteful number, since it uses less digits than its factorization.

668151960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3441 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 668151960 is about 25848.6355539320. The cubic root of 668151960 is about 874.2287451513.

It can be divided in two parts, 668 and 151960, that added together give a triangular number (152628 = T₅₅₂).

The spelling of 668151960 in words is "six hundred sixty-eight million, one hundred fifty-one thousand, nine hundred sixty".