66137423 has 16 divisors (see below), whose sum is σ = 77034240. Its totient is φ = 56145600.

The previous prime is 66137417. The next prime is 66137447. The reversal of 66137423 is 32473166.

It is a cyclic number.

It is not a de Polignac number, because 66137423 - 2¹⁴ = 66121039 is a prime.

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 66137423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137453) 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, 12611 + ... + 17067.

It is an arithmetic number, because the mean of its divisors is an integer number (4814640).

Almost surely, 2^66137423 is an apocalyptic number.

66137423 is a deficient number, since it is larger than the sum of its proper divisors (10896817).

66137423 is a wasteful number, since it uses less digits than its factorization.

66137423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4558.

The product of its digits is 18144, while the sum is 32.

The square root of 66137423 is about 8132.4918075581. The cubic root of 66137423 is about 404.4042921240.

The spelling of 66137423 in words is "sixty-six million, one hundred thirty-seven thousand, four hundred twenty-three".