1666672215 has 32 divisors (see below), whose sum is σ = 2949433536. Its totient is φ = 798336000.

The previous prime is 1666672177. The next prime is 1666672223. The reversal of 1666672215 is 5122766661.

It is not a de Polignac number, because 1666672215 - 2⁷ = 1666672087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108286 + ... + 122715.

It is an arithmetic number, because the mean of its divisors is an integer number (92169798).

Almost surely, 2^1666672215 is an apocalyptic number.

1666672215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666672215 is a deficient number, since it is larger than the sum of its proper divisors (1282761321).

1666672215 is a wasteful number, since it uses less digits than its factorization.

1666672215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231059.

The product of its digits is 181440, while the sum is 42.

The square root of 1666672215 is about 40824.8969992577. The cubic root of 1666672215 is about 1185.6324171505.

The spelling of 1666672215 in words is "one billion, six hundred sixty-six million, six hundred seventy-two thousand, two hundred fifteen".