66474542719 has 16 divisors (see below), whose sum is σ = 74432524320. Its totient is φ = 58944412800.

The previous prime is 66474542599. The next prime is 66474542749. The reversal of 66474542719 is 91724547466.

It is a happy number.

It is not a de Polignac number, because 66474542719 - 2⁷ = 66474542591 is a prime.

It is a super-2 number, since 2×66474542719² (a number of 22 digits) contains 22 as substring.

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 66474542719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66474542749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373257 + ... + 521794.

It is an arithmetic number, because the mean of its divisors is an integer number (4652032770).

Almost surely, 2^66474542719 is an apocalyptic number.

66474542719 is a deficient number, since it is larger than the sum of its proper divisors (7957981601).

66474542719 is a wasteful number, since it uses less digits than its factorization.

66474542719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895290.

The product of its digits is 10160640, while the sum is 55.

The spelling of 66474542719 in words is "sixty-six billion, four hundred seventy-four million, five hundred forty-two thousand, seven hundred nineteen".