64973689433 has 4 divisors (see below), whose sum is σ = 65032278180. Its totient is φ = 64915100688.

The previous prime is 64973689387. The next prime is 64973689439. The reversal of 64973689433 is 33498637946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26781977104 + 38191712329 = 163652^2 + 195427^2 .

It is a cyclic number.

It is not a de Polignac number, because 64973689433 - 2²⁴ = 64956912217 is a prime.

It is a super-2 number, since 2×64973689433² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64973689439) 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 3 ways as a sum of consecutive naturals, for example, 29292710 + ... + 29294927.

It is an arithmetic number, because the mean of its divisors is an integer number (16258069545).

Almost surely, 2^64973689433 is an apocalyptic number.

It is an amenable number.

64973689433 is a deficient number, since it is larger than the sum of its proper divisors (58588747).

64973689433 is a wasteful number, since it uses less digits than its factorization.

64973689433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58588746.

The product of its digits is 70543872, while the sum is 62.

The spelling of 64973689433 in words is "sixty-four billion, nine hundred seventy-three million, six hundred eighty-nine thousand, four hundred thirty-three".