64138937256463 has 2 divisors, whose sum is σ = 64138937256464. Its totient is φ = 64138937256462.

The previous prime is 64138937256439. The next prime is 64138937256577. The reversal of 64138937256463 is 36465273983146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64138937256463 is a prime.

It is a super-2 number, since 2×64138937256463² (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 (64138937250463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069468628231 + 32069468628232.

It is an arithmetic number, because the mean of its divisors is an integer number (32069468628232).

Almost surely, 2^{64138937256463} is an apocalyptic number.

64138937256463 is a deficient number, since it is larger than the sum of its proper divisors (1).

64138937256463 is an equidigital number, since it uses as much as digits as its factorization.

64138937256463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470292480, while the sum is 67.

The spelling of 64138937256463 in words is "sixty-four trillion, one hundred thirty-eight billion, nine hundred thirty-seven million, two hundred fifty-six thousand, four hundred sixty-three".