666214320 has 80 divisors (see below), whose sum is σ = 2155076352. Its totient is φ = 169931520.

The previous prime is 666214291. The next prime is 666214327. The reversal of 666214320 is 23412666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (666214327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54826 + ... + 65865.

Almost surely, 2^666214320 is an apocalyptic number.

666214320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666214320 is an abundant number, since it is smaller than the sum of its proper divisors (1488862032).

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

666214320 is a wasteful number, since it uses less digits than its factorization.

666214320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120730 (or 120724 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 666214320 is about 25811.1278327779. The cubic root of 666214320 is about 873.3828394263.

Adding to 666214320 its reverse (23412666), we get a palindrome (689626986).

The spelling of 666214320 in words is "six hundred sixty-six million, two hundred fourteen thousand, three hundred twenty".