66500004 has 24 divisors (see below), whose sum is σ = 157712128. Its totient is φ = 21803040.

The previous prime is 66500003. The next prime is 66500009. The reversal of 66500004 is 40000566.

It is not an unprimeable number, because it can be changed into a prime (66500003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44692 + ... + 46155.

Almost surely, 2^66500004 is an apocalyptic number.

It is an amenable number.

66500004 is an abundant number, since it is smaller than the sum of its proper divisors (91212124).

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

66500004 is a wasteful number, since it uses less digits than its factorization.

66500004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90915 (or 90913 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 66500004 is about 8154.7534604058. The cubic root of 66500004 is about 405.1419590753.

The spelling of 66500004 in words is "sixty-six million, five hundred thousand, four".