64645778293 has 2 divisors, whose sum is σ = 64645778294. Its totient is φ = 64645778292.

The previous prime is 64645778279. The next prime is 64645778357. The reversal of 64645778293 is 39287754646.

64645778293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64454038884 + 191739409 = 253878^2 + 13847^2 .

It is a cyclic number.

It is not a de Polignac number, because 64645778293 - 2⁵ = 64645778261 is a prime.

It is a super-2 number, since 2×64645778293² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64645778203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322889146 + 32322889147.

It is an arithmetic number, because the mean of its divisors is an integer number (32322889147).

Almost surely, 2^64645778293 is an apocalyptic number.

It is an amenable number.

64645778293 is a deficient number, since it is larger than the sum of its proper divisors (1).

64645778293 is an equidigital number, since it uses as much as digits as its factorization.

64645778293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60963840, while the sum is 61.

The spelling of 64645778293 in words is "sixty-four billion, six hundred forty-five million, seven hundred seventy-eight thousand, two hundred ninety-three".