66015006625 has 8 divisors (see below), whose sum is σ = 82386728424. Its totient is φ = 52812005200.

The previous prime is 66015006601. The next prime is 66015006649. The reversal of 66015006625 is 52660051066.

It is an interprime number because it is at equal distance from previous prime (66015006601) and next prime (66015006649).

It can be written as a sum of positive squares in 4 ways, for example, as 896643136 + 65118363489 = 29944^2 + 255183^2 .

It is not a de Polignac number, because 66015006625 - 2¹⁹ = 66014482337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264059902 + ... + 264060151.

It is an arithmetic number, because the mean of its divisors is an integer number (10298341053).

Almost surely, 2^66015006625 is an apocalyptic number.

It is an amenable number.

66015006625 is a deficient number, since it is larger than the sum of its proper divisors (16371721799).

66015006625 is an equidigital number, since it uses as much as digits as its factorization.

66015006625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528120068 (or 528120058 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 66015006625 in words is "sixty-six billion, fifteen million, six thousand, six hundred twenty-five".