66500007 has 24 divisors (see below), whose sum is σ = 104572656. Its totient is φ = 37473408.

The previous prime is 66500003. The next prime is 66500009. The reversal of 66500007 is 70000566.

It is not a de Polignac number, because 66500007 - 2² = 66500003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66500007.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 7633 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (4357194).

Almost surely, 2^66500007 is an apocalyptic number.

66500007 is a deficient number, since it is larger than the sum of its proper divisors (38072649).

66500007 is a wasteful number, since it uses less digits than its factorization.

66500007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6287 (or 6280 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 66500007 is about 8154.7536443476. The cubic root of 66500007 is about 405.1419651677.

The spelling of 66500007 in words is "sixty-six million, five hundred thousand, seven".