66220047 has 12 divisors (see below), whose sum is σ = 98236840. Its totient is φ = 42953328.

The previous prime is 66220031. The next prime is 66220069. The reversal of 66220047 is 74002266.

It is not a de Polignac number, because 66220047 - 2⁴ = 66220031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66220047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99097 + ... + 99762.

Almost surely, 2^66220047 is an apocalyptic number.

66220047 is a deficient number, since it is larger than the sum of its proper divisors (32016793).

66220047 is a wasteful number, since it uses less digits than its factorization.

66220047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198902 (or 198899 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 66220047 is about 8137.5700918640. The cubic root of 66220047 is about 404.5726264503.

The spelling of 66220047 in words is "sixty-six million, two hundred twenty thousand, forty-seven".