64354532393 has 4 divisors (see below), whose sum is σ = 68140093140. Its totient is φ = 60568971648.

The previous prime is 64354532387. The next prime is 64354532399. The reversal of 64354532393 is 39323545346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39323545346 = 2 ⋅19661772673.

It is an interprime number because it is at equal distance from previous prime (64354532387) and next prime (64354532399).

It can be written as a sum of positive squares in 2 ways, for example, as 48828624784 + 15525907609 = 220972^2 + 124603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64354532393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64354532399) 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, 1892780348 + ... + 1892780381.

It is an arithmetic number, because the mean of its divisors is an integer number (17035023285).

Almost surely, 2^64354532393 is an apocalyptic number.

It is an amenable number.

64354532393 is a deficient number, since it is larger than the sum of its proper divisors (3785560747).

64354532393 is a wasteful number, since it uses less digits than its factorization.

64354532393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785560746.

The product of its digits is 3499200, while the sum is 47.

The spelling of 64354532393 in words is "sixty-four billion, three hundred fifty-four million, five hundred thirty-two thousand, three hundred ninety-three".