64333993 has 2 divisors, whose sum is σ = 64333994. Its totient is φ = 64333992.

The previous prime is 64333991. The next prime is 64334027. The reversal of 64333993 is 39933346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34609689 + 29724304 = 5883^2 + 5452^2 .

It is a cyclic number.

It is not a de Polignac number, because 64333993 - 2¹ = 64333991 is a prime.

Together with 64333991, it forms a pair of twin primes.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (64333991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32166996 + 32166997.

It is an arithmetic number, because the mean of its divisors is an integer number (32166997).

Almost surely, 2^64333993 is an apocalyptic number.

It is an amenable number.

64333993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64333993 is an equidigital number, since it uses as much as digits as its factorization.

64333993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 40.

The square root of 64333993 is about 8020.8473991219. The cubic root of 64333993 is about 400.6946118378.

The spelling of 64333993 in words is "sixty-four million, three hundred thirty-three thousand, nine hundred ninety-three".