66213147 has 64 divisors (see below), whose sum is σ = 125604864. Its totient is φ = 29859840.

The previous prime is 66213131. The next prime is 66213187. The reversal of 66213147 is 74131266.

It is not a de Polignac number, because 66213147 - 2⁴ = 66213131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66213107) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50403 + ... + 51699.

It is an arithmetic number, because the mean of its divisors is an integer number (1962576).

Almost surely, 2^66213147 is an apocalyptic number.

66213147 is a deficient number, since it is larger than the sum of its proper divisors (59391717).

66213147 is a wasteful number, since it uses less digits than its factorization.

66213147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348.

The product of its digits is 6048, while the sum is 30.

The square root of 66213147 is about 8137.1461213376. The cubic root of 66213147 is about 404.5585740689.

The spelling of 66213147 in words is "sixty-six million, two hundred thirteen thousand, one hundred forty-seven".