66428425 has 24 divisors (see below), whose sum is σ = 94743936. Its totient is φ = 45258240.

The previous prime is 66428419. The next prime is 66428441. The reversal of 66428425 is 52482466.

It is not a de Polignac number, because 66428425 - 2¹⁵ = 66395657 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, 28089 + ... + 30361.

It is an arithmetic number, because the mean of its divisors is an integer number (3947664).

Almost surely, 2^66428425 is an apocalyptic number.

It is an amenable number.

66428425 is a deficient number, since it is larger than the sum of its proper divisors (28315511).

66428425 is a wasteful number, since it uses less digits than its factorization.

66428425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457 (or 2452 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The square root of 66428425 is about 8150.3634888267. The cubic root of 66428425 is about 404.9965452126.

The spelling of 66428425 in words is "sixty-six million, four hundred twenty-eight thousand, four hundred twenty-five".