64531440137 has 2 divisors, whose sum is σ = 64531440138. Its totient is φ = 64531440136.

The previous prime is 64531440119. The next prime is 64531440151. The reversal of 64531440137 is 73104413546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63451594816 + 1079845321 = 251896^2 + 32861^2 .

It is a cyclic number.

It is not a de Polignac number, because 64531440137 - 2²⁰ = 64530391561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64531440137.

It is not a weakly prime, because it can be changed into another prime (64531440107) 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, 32265720068 + 32265720069.

It is an arithmetic number, because the mean of its divisors is an integer number (32265720069).

Almost surely, 2^64531440137 is an apocalyptic number.

It is an amenable number.

64531440137 is a deficient number, since it is larger than the sum of its proper divisors (1).

64531440137 is an equidigital number, since it uses as much as digits as its factorization.

64531440137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 64531440137 in words is "sixty-four billion, five hundred thirty-one million, four hundred forty thousand, one hundred thirty-seven".