666020715 has 8 divisors (see below), whose sum is σ = 1065633168. Its totient is φ = 355211040.

The previous prime is 666020671. The next prime is 666020717. The reversal of 666020715 is 517020666.

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

It is not a de Polignac number, because 666020715 - 2¹² = 666016619 is a prime.

It is a super-2 number, since 2×666020715² = 887167185618222450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666020717) 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, 22200676 + ... + 22200705.

It is an arithmetic number, because the mean of its divisors is an integer number (133204146).

Almost surely, 2^666020715 is an apocalyptic number.

666020715 is a deficient number, since it is larger than the sum of its proper divisors (399612453).

666020715 is a wasteful number, since it uses less digits than its factorization.

666020715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44401389.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 666020715 is about 25807.3771429799. The cubic root of 666020715 is about 873.2982281825.

The spelling of 666020715 in words is "six hundred sixty-six million, twenty thousand, seven hundred fifteen".