666142464 has 72 divisors (see below), whose sum is σ = 1909316752. Its totient is φ = 204963840.

The previous prime is 666142429. The next prime is 666142469. The reversal of 666142464 is 464241666.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666142469) 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, 23377 + ... + 43344.

Almost surely, 2^666142464 is an apocalyptic number.

666142464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

666142464 is an abundant number, since it is smaller than the sum of its proper divisors (1243174288).

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

666142464 is a wasteful number, since it uses less digits than its factorization.

666142464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66753 (or 66739 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The square root of 666142464 is about 25809.7358374703. The cubic root of 666142464 is about 873.3514380930.

The spelling of 666142464 in words is "six hundred sixty-six million, one hundred forty-two thousand, four hundred sixty-four".