43979855506 has 4 divisors (see below), whose sum is σ = 65969783262. Its totient is φ = 21989927752.

The previous prime is 43979855483. The next prime is 43979855519. The reversal of 43979855506 is 60555897934.

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

It can be written as a sum of positive squares in only one way, i.e., 37925615025 + 6054240481 = 194745^2 + 77809^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10994963875 + ... + 10994963878.

Almost surely, 2^43979855506 is an apocalyptic number.

43979855506 is a deficient number, since it is larger than the sum of its proper divisors (21989927756).

43979855506 is a wasteful number, since it uses less digits than its factorization.

43979855506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21989927755.

The product of its (nonzero) digits is 40824000, while the sum is 61.

The spelling of 43979855506 in words is "forty-three billion, nine hundred seventy-nine million, eight hundred fifty-five thousand, five hundred six".