64440359281031 has 2 divisors, whose sum is σ = 64440359281032. Its totient is φ = 64440359281030.

The previous prime is 64440359280977. The next prime is 64440359281037. The reversal of 64440359281031 is 13018295304446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64440359281031 - 2¹⁴ = 64440359264647 is a prime.

It is a super-2 number, since 2×64440359281031² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64440359281037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220179640515 + 32220179640516.

It is an arithmetic number, because the mean of its divisors is an integer number (32220179640516).

Almost surely, 2^{64440359281031} is an apocalyptic number.

64440359281031 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440359281031 is an equidigital number, since it uses as much as digits as its factorization.

64440359281031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 64440359281031 in words is "sixty-four trillion, four hundred forty billion, three hundred fifty-nine million, two hundred eighty-one thousand, thirty-one".