66238623 has 12 divisors (see below), whose sum is σ = 104376168. Its totient is φ = 40144560.

The previous prime is 66238607. The next prime is 66238631. The reversal of 66238623 is 32683266.

66238623 is a `hidden beast` number, since 6 + 6 + 23 + 8 + 623 = 666.

It is not a de Polignac number, because 66238623 - 2⁴ = 66238607 is a prime.

It is a super-2 number, since 2×66238623² = 8775110353872258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66238603) 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 11 ways as a sum of consecutive naturals, for example, 334440 + ... + 334637.

It is an arithmetic number, because the mean of its divisors is an integer number (8698014).

Almost surely, 2^66238623 is an apocalyptic number.

66238623 is a deficient number, since it is larger than the sum of its proper divisors (38137545).

66238623 is a wasteful number, since it uses less digits than its factorization.

66238623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669094 (or 669091 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 66238623 is about 8138.7113844883. The cubic root of 66238623 is about 404.6104530544.

The spelling of 66238623 in words is "sixty-six million, two hundred thirty-eight thousand, six hundred twenty-three".