66557044 has 12 divisors (see below), whose sum is σ = 116687844. Its totient is φ = 33217664.

The previous prime is 66557021. The next prime is 66557047. The reversal of 66557044 is 44075566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 36723600 + 29833444 = 6060^2 + 5462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66556994 and 66557012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12709 + ... + 17164.

It is an arithmetic number, because the mean of its divisors is an integer number (9723987).

Almost surely, 2^66557044 is an apocalyptic number.

It is an amenable number.

66557044 is a deficient number, since it is larger than the sum of its proper divisors (50130800).

66557044 is a wasteful number, since it uses less digits than its factorization.

66557044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30434 (or 30432 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 66557044 is about 8158.2500574572. The cubic root of 66557044 is about 405.2577620418.

The spelling of 66557044 in words is "sixty-six million, five hundred fifty-seven thousand, forty-four".