66254644 has 24 divisors (see below), whose sum is σ = 124504128. Its totient is φ = 30737280.

The previous prime is 66254641. The next prime is 66254659. The reversal of 66254644 is 44645266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66254641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034 + ... + 11689.

It is an arithmetic number, because the mean of its divisors is an integer number (5187672).

Almost surely, 2^66254644 is an apocalyptic number.

It is an amenable number.

66254644 is a deficient number, since it is larger than the sum of its proper divisors (58249484).

66254644 is a wasteful number, since it uses less digits than its factorization.

66254644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13815 (or 13813 counting only the distinct ones).

The product of its digits is 138240, while the sum is 37.

The square root of 66254644 is about 8139.6955717029. The cubic root of 66254644 is about 404.6430711918.

The spelling of 66254644 in words is "sixty-six million, two hundred fifty-four thousand, six hundred forty-four".