66136990 has 16 divisors (see below), whose sum is σ = 121580352. Its totient is φ = 25891744.

The previous prime is 66136963. The next prime is 66136991. The reversal of 66136990 is 9963166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66136991) 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, 69889 + ... + 70828.

It is an arithmetic number, because the mean of its divisors is an integer number (7598772).

Almost surely, 2^66136990 is an apocalyptic number.

66136990 is a deficient number, since it is larger than the sum of its proper divisors (55443362).

66136990 is a wasteful number, since it uses less digits than its factorization.

66136990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140771.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 66136990 is about 8132.4651859077. The cubic root of 66136990 is about 404.4034095806.

The spelling of 66136990 in words is "sixty-six million, one hundred thirty-six thousand, nine hundred ninety".