64243363973 has 2 divisors, whose sum is σ = 64243363974. Its totient is φ = 64243363972.

The previous prime is 64243363883. The next prime is 64243364051. The reversal of 64243363973 is 37936334246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39349466689 + 24893897284 = 198367^2 + 157778^2 .

It is a cyclic number.

It is not a de Polignac number, because 64243363973 - 2¹⁰ = 64243362949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64243362973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32121681986 + 32121681987.

It is an arithmetic number, because the mean of its divisors is an integer number (32121681987).

Almost surely, 2^64243363973 is an apocalyptic number.

It is an amenable number.

64243363973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64243363973 is an equidigital number, since it uses as much as digits as its factorization.

64243363973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 50.

The spelling of 64243363973 in words is "sixty-four billion, two hundred forty-three million, three hundred sixty-three thousand, nine hundred seventy-three".