66623013 has 8 divisors (see below), whose sum is σ = 98700800. Its totient is φ = 44415324.

The previous prime is 66623009. The next prime is 66623027. The reversal of 66623013 is 31032666.

It is not a de Polignac number, because 66623013 - 2² = 66623009 is a prime.

It is a super-2 number, since 2×66623013² = 8877251722396338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2467519 = 66623013 / (6 + 6 + 6 + 2 + 3 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66623003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233733 + ... + 1233786.

It is an arithmetic number, because the mean of its divisors is an integer number (12337600).

Almost surely, 2^66623013 is an apocalyptic number.

It is an amenable number.

66623013 is a deficient number, since it is larger than the sum of its proper divisors (32077787).

66623013 is a wasteful number, since it uses less digits than its factorization.

66623013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467528 (or 2467522 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 66623013 is about 8162.2921413044. The cubic root of 66623013 is about 405.3916102409.

Adding to 66623013 its reverse (31032666), we get a palindrome (97655679).

The spelling of 66623013 in words is "sixty-six million, six hundred twenty-three thousand, thirteen".