64425666 has 16 divisors (see below), whose sum is σ = 129780000. Its totient is φ = 21320448.

The previous prime is 64425661. The next prime is 64425667. The reversal of 64425666 is 66652446.

It is not an unprimeable number, because it can be changed into a prime (64425661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37791 + ... + 39458.

It is an arithmetic number, because the mean of its divisors is an integer number (8111250).

Almost surely, 2^64425666 is an apocalyptic number.

64425666 is an abundant number, since it is smaller than the sum of its proper divisors (65354334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64425666 is a wasteful number, since it uses less digits than its factorization.

64425666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77393.

The product of its digits is 207360, while the sum is 39.

The square root of 64425666 is about 8026.5600352829. The cubic root of 64425666 is about 400.8848453451.

The spelling of 64425666 in words is "sixty-four million, four hundred twenty-five thousand, six hundred sixty-six".