64943298738 has 12 divisors (see below), whose sum is σ = 140710480638. Its totient is φ = 21647766240.

The previous prime is 64943298737. The next prime is 64943298773. The reversal of 64943298738 is 83789234946.

64943298738 is a `hidden beast` number, since 6 + 49 + 432 + 98 + 73 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32899792689 + 32043506049 = 181383^2 + 179007^2 .

It is a super-2 number, since 2×64943298738² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64943298733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1803980503 + ... + 1803980538.

Almost surely, 2^64943298738 is an apocalyptic number.

64943298738 is an abundant number, since it is smaller than the sum of its proper divisors (75767181900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64943298738 is a wasteful number, since it uses less digits than its factorization.

64943298738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607961049 (or 3607961046 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The spelling of 64943298738 in words is "sixty-four billion, nine hundred forty-three million, two hundred ninety-eight thousand, seven hundred thirty-eight".