64550789 has 2 divisors, whose sum is σ = 64550790. Its totient is φ = 64550788.

The previous prime is 64550777. The next prime is 64550791. The reversal of 64550789 is 98705546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63329764 + 1221025 = 7958^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 64550789 - 2²⁰ = 63502213 is a prime.

Together with 64550791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64550729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32275394 + 32275395.

It is an arithmetic number, because the mean of its divisors is an integer number (32275395).

Almost surely, 2^64550789 is an apocalyptic number.

It is an amenable number.

64550789 is a deficient number, since it is larger than the sum of its proper divisors (1).

64550789 is an equidigital number, since it uses as much as digits as its factorization.

64550789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 64550789 is about 8034.3505649181. The cubic root of 64550789 is about 401.1442009729.

The spelling of 64550789 in words is "sixty-four million, five hundred fifty thousand, seven hundred eighty-nine".