66364639 has 16 divisors (see below), whose sum is σ = 74908800. Its totient is φ = 58275360.

The previous prime is 66364621. The next prime is 66364657. The reversal of 66364639 is 93646366.

It is an interprime number because it is at equal distance from previous prime (66364621) and next prime (66364657).

It is not a de Polignac number, because 66364639 - 2⁵ = 66364607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66364595 and 66364604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66364699) by changing a digit.

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, 38212 + ... + 39910.

It is an arithmetic number, because the mean of its divisors is an integer number (4681800).

Almost surely, 2^66364639 is an apocalyptic number.

66364639 is a deficient number, since it is larger than the sum of its proper divisors (8544161).

66364639 is a wasteful number, since it uses less digits than its factorization.

66364639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 419904, while the sum is 43.

The square root of 66364639 is about 8146.4494720093. The cubic root of 66364639 is about 404.8668749068.

The spelling of 66364639 in words is "sixty-six million, three hundred sixty-four thousand, six hundred thirty-nine".