66883913 has 2 divisors, whose sum is σ = 66883914. Its totient is φ = 66883912.

The previous prime is 66883907. The next prime is 66883939. The reversal of 66883913 is 31938866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36820624 + 30063289 = 6068^2 + 5483^2 .

It is a cyclic number.

It is not a de Polignac number, because 66883913 - 2⁴ = 66883897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66883813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33441956 + 33441957.

It is an arithmetic number, because the mean of its divisors is an integer number (33441957).

Almost surely, 2^66883913 is an apocalyptic number.

It is an amenable number.

66883913 is a deficient number, since it is larger than the sum of its proper divisors (1).

66883913 is an equidigital number, since it uses as much as digits as its factorization.

66883913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 44.

The square root of 66883913 is about 8178.2585554628. The cubic root of 66883913 is about 405.9201008375.

It can be divided in two parts, 6688 and 3913, that added together give a palindrome (10601).

The spelling of 66883913 in words is "sixty-six million, eight hundred eighty-three thousand, nine hundred thirteen".