66556070 has 32 divisors (see below), whose sum is σ = 141336576. Its totient is φ = 22082400.

The previous prime is 66556067. The next prime is 66556099. The reversal of 66556070 is 7065566.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66556070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13166 + ... + 17505.

It is an arithmetic number, because the mean of its divisors is an integer number (4416768).

Almost surely, 2^66556070 is an apocalyptic number.

66556070 is an abundant number, since it is smaller than the sum of its proper divisors (74780506).

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

66556070 is a wasteful number, since it uses less digits than its factorization.

66556070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30716.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 66556070 is about 8158.1903630646. The cubic root of 66556070 is about 405.2557851763.

The spelling of 66556070 in words is "sixty-six million, five hundred fifty-six thousand, seventy".