66427599 has 16 divisors (see below), whose sum is σ = 102228480. Its totient is φ = 37581600.

The previous prime is 66427589. The next prime is 66427609. The reversal of 66427599 is 99572466.

It is an interprime number because it is at equal distance from previous prime (66427589) and next prime (66427609).

It is not a de Polignac number, because 66427599 - 2⁸ = 66427343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66427549) 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, 13539 + ... + 17780.

It is an arithmetic number, because the mean of its divisors is an integer number (6389280).

Almost surely, 2^66427599 is an apocalyptic number.

66427599 is a deficient number, since it is larger than the sum of its proper divisors (35800881).

66427599 is a wasteful number, since it uses less digits than its factorization.

66427599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31430.

The product of its digits is 816480, while the sum is 48.

The square root of 66427599 is about 8150.3128160826. The cubic root of 66427599 is about 404.9948665711.

It can be divided in two parts, 6642 and 7599, that added together give a palindrome (14241).

The spelling of 66427599 in words is "sixty-six million, four hundred twenty-seven thousand, five hundred ninety-nine".