668055570 has 128 divisors (see below), whose sum is σ = 1992646656. Its totient is φ = 139574016.

The previous prime is 668055547. The next prime is 668055601. The reversal of 668055570 is 75550866.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 290967 + ... + 293253.

It is an arithmetic number, because the mean of its divisors is an integer number (15567552).

Almost surely, 2^668055570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668055570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996323328).

668055570 is an abundant number, since it is smaller than the sum of its proper divisors (1324591086).

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

668055570 is a wasteful number, since it uses less digits than its factorization.

668055570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424.

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 668055570 is about 25846.7709782093. The cubic root of 668055570 is about 874.1867033373.

The spelling of 668055570 in words is "six hundred sixty-eight million, fifty-five thousand, five hundred seventy".