666428983 has 8 divisors (see below), whose sum is σ = 727315200. Its totient is φ = 605593080.

The previous prime is 666428977. The next prime is 666429011. The reversal of 666428983 is 389824666.

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

It is a cyclic number.

It is not a de Polignac number, because 666428983 - 2²⁵ = 632874551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666428983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666428953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18466 + ... + 40912.

It is an arithmetic number, because the mean of its divisors is an integer number (90914400).

Almost surely, 2^666428983 is an apocalyptic number.

666428983 is a deficient number, since it is larger than the sum of its proper divisors (60886217).

666428983 is a wasteful number, since it uses less digits than its factorization.

666428983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25157.

The product of its digits is 2985984, while the sum is 52.

The square root of 666428983 is about 25815.2858399825. The cubic root of 666428983 is about 873.4766344920.

It can be divided in two parts, 66642 and 8983, that added together give a square (75625 = 275²).

The spelling of 666428983 in words is "six hundred sixty-six million, four hundred twenty-eight thousand, nine hundred eighty-three".