43873643522 has 4 divisors (see below), whose sum is σ = 65810465286. Its totient is φ = 21936821760.

The previous prime is 43873643521. The next prime is 43873643531. The reversal of 43873643522 is 22534637834.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22534637834 = 2 ⋅11267318917.

It can be written as a sum of positive squares in only one way, i.e., 26683549201 + 17190094321 = 163351^2 + 131111^2 .

It is not an unprimeable number, because it can be changed into a prime (43873643521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968410879 + ... + 10968410882.

Almost surely, 2^43873643522 is an apocalyptic number.

43873643522 is a deficient number, since it is larger than the sum of its proper divisors (21936821764).

43873643522 is a wasteful number, since it uses less digits than its factorization.

43873643522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21936821763.

The product of its digits is 2903040, while the sum is 47.

The spelling of 43873643522 in words is "forty-three billion, eight hundred seventy-three million, six hundred forty-three thousand, five hundred twenty-two".