668898187704 has 128 divisors (see below), whose sum is σ = 1904107060800. Its totient is φ = 217443502080.

The previous prime is 668898187691. The next prime is 668898187739. The reversal of 668898187704 is 407781898866.

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 25288374 + ... + 25314810.

Almost surely, 2^668898187704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668898187704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952053530400).

668898187704 is an abundant number, since it is smaller than the sum of its proper divisors (1235208873096).

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

668898187704 is a wasteful number, since it uses less digits than its factorization.

668898187704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29350 (or 29340 counting only the distinct ones).

The product of its (nonzero) digits is 260112384, while the sum is 72.

The spelling of 668898187704 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred four".