66663040 has 32 divisors (see below), whose sum is σ = 159367860. Its totient is φ = 26664960.

The previous prime is 66663017. The next prime is 66663041. The reversal of 66663040 is 4036666.

It can be written as a sum of positive squares in 2 ways, for example, as 66455104 + 207936 = 8152^2 + 456^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 66662993 and 66663011.

It is not an unprimeable number, because it can be changed into a prime (66663041) 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, 51441 + ... + 52720.

Almost surely, 2^66663040 is an apocalyptic number.

It is an amenable number.

66663040 is an abundant number, since it is smaller than the sum of its proper divisors (92704820).

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

66663040 is a wasteful number, since it uses less digits than its factorization.

66663040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104180 (or 104168 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 66663040 is about 8164.7437191868. The cubic root of 66663040 is about 405.4727801985.

The spelling of 66663040 in words is "sixty-six million, six hundred sixty-three thousand, forty".