66572719 has 6 divisors (see below), whose sum is σ = 68948360. Its totient is φ = 64276296.

The previous prime is 66572659. The next prime is 66572743. The reversal of 66572719 is 91727566.

It is not a de Polignac number, because 66572719 - 2¹⁵ = 66539951 is a prime.

It is a super-2 number, since 2×66572719² = 8863853830105922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38739 + ... + 40420.

Almost surely, 2^66572719 is an apocalyptic number.

66572719 is a deficient number, since it is larger than the sum of its proper divisors (2375641).

66572719 is an equidigital number, since it uses as much as digits as its factorization.

66572719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79217 (or 79188 counting only the distinct ones).

The product of its digits is 158760, while the sum is 43.

The square root of 66572719 is about 8159.2106848641. The cubic root of 66572719 is about 405.2895739354.

The spelling of 66572719 in words is "sixty-six million, five hundred seventy-two thousand, seven hundred nineteen".