64962448781 has 2 divisors, whose sum is σ = 64962448782. Its totient is φ = 64962448780.

The previous prime is 64962448717. The next prime is 64962448813. The reversal of 64962448781 is 18784426946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36850561225 + 28111887556 = 191965^2 + 167666^2 .

It is a cyclic number.

It is not a de Polignac number, because 64962448781 - 2⁶ = 64962448717 is a prime.

It is a super-2 number, since 2×64962448781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64962448781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64962448981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32481224390 + 32481224391.

It is an arithmetic number, because the mean of its divisors is an integer number (32481224391).

Almost surely, 2^64962448781 is an apocalyptic number.

It is an amenable number.

64962448781 is a deficient number, since it is larger than the sum of its proper divisors (1).

64962448781 is an equidigital number, since it uses as much as digits as its factorization.

64962448781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18579456, while the sum is 59.

The spelling of 64962448781 in words is "sixty-four billion, nine hundred sixty-two million, four hundred forty-eight thousand, seven hundred eighty-one".