66440104 has 16 divisors (see below), whose sum is σ = 125341920. Its totient is φ = 33015600.

The previous prime is 66440071. The next prime is 66440107. The reversal of 66440104 is 40104466.

It is not an unprimeable number, because it can be changed into a prime (66440107) 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, 24172 + ... + 26779.

It is an arithmetic number, because the mean of its divisors is an integer number (7833870).

Almost surely, 2^66440104 is an apocalyptic number.

It is an amenable number.

66440104 is a deficient number, since it is larger than the sum of its proper divisors (58901816).

66440104 is a wasteful number, since it uses less digits than its factorization.

66440104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51120 (or 51116 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 66440104 is about 8151.0799284512. The cubic root of 66440104 is about 405.0202784136.

The spelling of 66440104 in words is "sixty-six million, four hundred forty thousand, one hundred four".