66613206 has 16 divisors (see below), whose sum is σ = 145338048. Its totient is φ = 20185800.

The previous prime is 66613201. The next prime is 66613219. The reversal of 66613206 is 60231666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613201) 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, 504580 + ... + 504711.

It is an arithmetic number, because the mean of its divisors is an integer number (9083628).

Almost surely, 2^66613206 is an apocalyptic number.

66613206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66613206 is an abundant number, since it is smaller than the sum of its proper divisors (78724842).

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

66613206 is a wasteful number, since it uses less digits than its factorization.

66613206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009307.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66613206 is about 8161.6913688279. The cubic root of 66613206 is about 405.3717178622.

The spelling of 66613206 in words is "sixty-six million, six hundred thirteen thousand, two hundred six".