66608478425 has 12 divisors (see below), whose sum is σ = 82631904300. Its totient is φ = 53262659520.

The previous prime is 66608478421. The next prime is 66608478437. The reversal of 66608478425 is 52487480666.

66608478425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 9056948224 + 57551530201 = 95168^2 + 239899^2 .

It is not a de Polignac number, because 66608478425 - 2² = 66608478421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66608478421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546650 + ... + 657299.

It is an arithmetic number, because the mean of its divisors is an integer number (6885992025).

Almost surely, 2^66608478425 is an apocalyptic number.

It is an amenable number.

66608478425 is a deficient number, since it is larger than the sum of its proper divisors (16023425875).

66608478425 is a wasteful number, since it uses less digits than its factorization.

66608478425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206172 (or 1206167 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 66608478425 in words is "sixty-six billion, six hundred eight million, four hundred seventy-eight thousand, four hundred twenty-five".