66566146415 has 4 divisors (see below), whose sum is σ = 79879375704. Its totient is φ = 53252917128.

The previous prime is 66566146357. The next prime is 66566146421. The reversal of 66566146415 is 51464166566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66566146415 - 2⁶ = 66566146351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6656614637 + ... + 6656614646.

It is an arithmetic number, because the mean of its divisors is an integer number (19969843926).

Almost surely, 2^66566146415 is an apocalyptic number.

66566146415 is a deficient number, since it is larger than the sum of its proper divisors (13313229289).

66566146415 is a wasteful number, since it uses less digits than its factorization.

66566146415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13313229288.

The product of its digits is 3110400, while the sum is 50.

The spelling of 66566146415 in words is "sixty-six billion, five hundred sixty-six million, one hundred forty-six thousand, four hundred fifteen".