66650901 has 4 divisors (see below), whose sum is σ = 88867872. Its totient is φ = 44433932.

The previous prime is 66650873. The next prime is 66650921. The reversal of 66650901 is 10905666.

66650901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66650901 is a prime.

It is a super-2 number, since 2×66650901² = 8884685208223602, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11108481 + ... + 11108486.

It is an arithmetic number, because the mean of its divisors is an integer number (22216968).

Almost surely, 2^66650901 is an apocalyptic number.

It is an amenable number.

66650901 is a deficient number, since it is larger than the sum of its proper divisors (22216971).

66650901 is a wasteful number, since it uses less digits than its factorization.

66650901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22216970.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 66650901 is about 8164.0003062224. Note that the first 3 decimals coincide. The cubic root of 66650901 is about 405.4481671952.

The spelling of 66650901 in words is "sixty-six million, six hundred fifty thousand, nine hundred one".