6615666007 has 4 divisors (see below), whose sum is σ = 6660066600. Its totient is φ = 6571265416.

The previous prime is 6615665939. The next prime is 6615666097. The reversal of 6615666007 is 7006665166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7006665166 = 2 ⋅3503332583.

It is a cyclic number.

It is not a de Polignac number, because 6615666007 - 2²⁷ = 6481448279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6615666097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22200073 + ... + 22200370.

It is an arithmetic number, because the mean of its divisors is an integer number (1665016650).

Almost surely, 2^6615666007 is an apocalyptic number.

6615666007 is a deficient number, since it is larger than the sum of its proper divisors (44400593).

6615666007 is a wasteful number, since it uses less digits than its factorization.

6615666007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44400592.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 6615666007 is about 81336.7445070185. The cubic root of 6615666007 is about 1877.2604211666.

The spelling of 6615666007 in words is "six billion, six hundred fifteen million, six hundred sixty-six thousand, seven".