64738761512 has 16 divisors (see below), whose sum is σ = 121460456340. Its totient is φ = 32349306496.

The previous prime is 64738761511. The next prime is 64738761517. The reversal of 64738761512 is 21516783746.

64738761512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64641028516 + 97732996 = 254246^2 + 9886^2 .

It is a super-2 number, since 2×64738761512² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64738761511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495573 + ... + 2521380.

Almost surely, 2^64738761512 is an apocalyptic number.

It is an amenable number.

64738761512 is a deficient number, since it is larger than the sum of its proper divisors (56721694828).

64738761512 is a wasteful number, since it uses less digits than its factorization.

64738761512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018572 (or 5018568 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 50.

The spelling of 64738761512 in words is "sixty-four billion, seven hundred thirty-eight million, seven hundred sixty-one thousand, five hundred twelve".