64136807243 has 4 divisors (see below), whose sum is σ = 64236554088. Its totient is φ = 64037060400.

The previous prime is 64136807219. The next prime is 64136807269. The reversal of 64136807243 is 34270863146.

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

It is a cyclic number.

It is not a de Polignac number, because 64136807243 - 2³² = 59841839947 is a prime.

It is a super-2 number, since 2×64136807243² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64136807194 and 64136807203.

It is not an unprimeable number, because it can be changed into a prime (64136807213) 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, 49872458 + ... + 49873743.

It is an arithmetic number, because the mean of its divisors is an integer number (16059138522).

Almost surely, 2^64136807243 is an apocalyptic number.

64136807243 is a deficient number, since it is larger than the sum of its proper divisors (99746845).

64136807243 is an equidigital number, since it uses as much as digits as its factorization.

64136807243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99746844.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 64136807243 in words is "sixty-four billion, one hundred thirty-six million, eight hundred seven thousand, two hundred forty-three".