66615425 has 24 divisors (see below), whose sum is σ = 88461600. Its totient is φ = 49610880.

The previous prime is 66615397. The next prime is 66615427. The reversal of 66615425 is 52451666.

66615425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66615425 - 2⁶ = 66615361 is a prime.

It is a super-2 number, since 2×66615425² = 8875229695861250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66615427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26837 + ... + 29213.

It is an arithmetic number, because the mean of its divisors is an integer number (3685900).

Almost surely, 2^66615425 is an apocalyptic number.

It is an amenable number.

66615425 is a deficient number, since it is larger than the sum of its proper divisors (21846175).

66615425 is a wasteful number, since it uses less digits than its factorization.

66615425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 2460 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 66615425 is about 8161.8273076560. The cubic root of 66615425 is about 405.3762190210.

The spelling of 66615425 in words is "sixty-six million, six hundred fifteen thousand, four hundred twenty-five".