52640693221 has 2 divisors, whose sum is σ = 52640693222. Its totient is φ = 52640693220.

The previous prime is 52640693191. The next prime is 52640693327. The reversal of 52640693221 is 12239604625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34748688100 + 17892005121 = 186410^2 + 133761^2 .

It is a cyclic number.

It is not a de Polignac number, because 52640693221 - 2³¹ = 50493209573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52640694221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26320346610 + 26320346611.

It is an arithmetic number, because the mean of its divisors is an integer number (26320346611).

Almost surely, 2^52640693221 is an apocalyptic number.

It is an amenable number.

52640693221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52640693221 is an equidigital number, since it uses as much as digits as its factorization.

52640693221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 52640693221 in words is "fifty-two billion, six hundred forty million, six hundred ninety-three thousand, two hundred twenty-one".