66743715 has 16 divisors (see below), whose sum is σ = 107106048. Its totient is φ = 35491296.

The previous prime is 66743701. The next prime is 66743737. The reversal of 66743715 is 51734766.

It is not a de Polignac number, because 66743715 - 2¹⁵ = 66710947 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1207 + ... + 11616.

It is an arithmetic number, because the mean of its divisors is an integer number (6694128).

Almost surely, 2^66743715 is an apocalyptic number.

66743715 is a deficient number, since it is larger than the sum of its proper divisors (40362333).

66743715 is a wasteful number, since it uses less digits than its factorization.

66743715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13178.

The product of its digits is 105840, while the sum is 39.

The square root of 66743715 is about 8169.6826743760. The cubic root of 66743715 is about 405.6362807413.

The spelling of 66743715 in words is "sixty-six million, seven hundred forty-three thousand, seven hundred fifteen".