66464939 has 2 divisors, whose sum is σ = 66464940. Its totient is φ = 66464938.

The previous prime is 66464903. The next prime is 66464947. The reversal of 66464939 is 93946466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66464939 - 2⁸ = 66464683 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66464893 and 66464902.

It is not a weakly prime, because it can be changed into another prime (66464039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33232469 + 33232470.

It is an arithmetic number, because the mean of its divisors is an integer number (33232470).

Almost surely, 2^66464939 is an apocalyptic number.

66464939 is a deficient number, since it is larger than the sum of its proper divisors (1).

66464939 is an equidigital number, since it uses as much as digits as its factorization.

66464939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 47.

The square root of 66464939 is about 8152.6032038852. The cubic root of 66464939 is about 405.0707370220.

The spelling of 66464939 in words is "sixty-six million, four hundred sixty-four thousand, nine hundred thirty-nine".