66661004 has 6 divisors (see below), whose sum is σ = 116656764. Its totient is φ = 33330500.

The previous prime is 66661003. The next prime is 66661009. The reversal of 66661004 is 40016666.

It is not an unprimeable number, because it can be changed into a prime (66661003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332622 + ... + 8332629.

It is an arithmetic number, because the mean of its divisors is an integer number (19442794).

Almost surely, 2^66661004 is an apocalyptic number.

It is an amenable number.

66661004 is a deficient number, since it is larger than the sum of its proper divisors (49995760).

66661004 is a wasteful number, since it uses less digits than its factorization.

66661004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16665255 (or 16665253 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66661004 is about 8164.6190358154. The cubic root of 66661004 is about 405.4686522190.

The spelling of 66661004 in words is "sixty-six million, six hundred sixty-one thousand, four".