66806425 has 24 divisors (see below), whose sum is σ = 96993792. Its totient is φ = 44688000.

The previous prime is 66806387. The next prime is 66806431. The reversal of 66806425 is 52460866.

It is not a de Polignac number, because 66806425 - 2⁹ = 66805913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2520 + ... + 11830.

It is an arithmetic number, because the mean of its divisors is an integer number (4041408).

Almost surely, 2^66806425 is an apocalyptic number.

It is an amenable number.

66806425 is a deficient number, since it is larger than the sum of its proper divisors (30187367).

66806425 is a wasteful number, since it uses less digits than its factorization.

66806425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369 (or 9364 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 66806425 is about 8173.5197436600. The cubic root of 66806425 is about 405.7632814066.

The spelling of 66806425 in words is "sixty-six million, eight hundred six thousand, four hundred twenty-five".