64138937250439 has 2 divisors, whose sum is σ = 64138937250440. Its totient is φ = 64138937250438.

The previous prime is 64138937250407. The next prime is 64138937250463. The reversal of 64138937250439 is 93405273983146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64138937250439 - 2⁵ = 64138937250407 is a prime.

It is a super-2 number, since 2×64138937250439² (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 (64138937256439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069468625219 + 32069468625220.

It is an arithmetic number, because the mean of its divisors is an integer number (32069468625220).

It is a 1-persistent number, because it is pandigital, but 2⋅64138937250439 = 128277874500878 is not.

Almost surely, 2^{64138937250439} is an apocalyptic number.

64138937250439 is a deficient number, since it is larger than the sum of its proper divisors (1).

64138937250439 is an equidigital number, since it uses as much as digits as its factorization.

64138937250439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117573120, while the sum is 64.

The spelling of 64138937250439 in words is "sixty-four trillion, one hundred thirty-eight billion, nine hundred thirty-seven million, two hundred fifty thousand, four hundred thirty-nine".