66457623 has 4 divisors (see below), whose sum is σ = 88610168. Its totient is φ = 44305080.

The previous prime is 66457621. The next prime is 66457637. The reversal of 66457623 is 32675466.

66457623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66457623 - 2¹ = 66457621 is a prime.

It is a super-3 number, since 3×66457623³ (a number of 24 digits) contains 333 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 (66457621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11076268 + ... + 11076273.

It is an arithmetic number, because the mean of its divisors is an integer number (22152542).

Almost surely, 2^66457623 is an apocalyptic number.

66457623 is a deficient number, since it is larger than the sum of its proper divisors (22152545).

66457623 is a wasteful number, since it uses less digits than its factorization.

66457623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22152544.

The product of its digits is 181440, while the sum is 39.

The square root of 66457623 is about 8152.1545004986. The cubic root of 66457623 is about 405.0558740166.

The spelling of 66457623 in words is "sixty-six million, four hundred fifty-seven thousand, six hundred twenty-three".