1666666572 has 48 divisors (see below), whose sum is σ = 4061460480. Its totient is φ = 530944128.

The previous prime is 1666666559. The next prime is 1666666597. The reversal of 1666666572 is 2756666661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483768 + ... + 487200.

It is an arithmetic number, because the mean of its divisors is an integer number (84613760).

Almost surely, 2^1666666572 is an apocalyptic number.

1666666572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666666572 is an abundant number, since it is smaller than the sum of its proper divisors (2394793908).

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

1666666572 is a wasteful number, since it uses less digits than its factorization.

1666666572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222 (or 5220 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 51.

The square root of 1666666572 is about 40824.8278869611. The cubic root of 1666666572 is about 1185.6310790487.

It can be divided in two parts, 16666 and 66572, that added together give a palindrome (83238).

The spelling of 1666666572 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred seventy-two".