43156644631 has 4 divisors (see below), whose sum is σ = 45428047000. Its totient is φ = 40885242264.

The previous prime is 43156644613. The next prime is 43156644667. The reversal of 43156644631 is 13644665134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13644665134 = 2 ⋅6822332567.

It is not a de Polignac number, because 43156644631 - 2¹⁵ = 43156611863 is a prime.

It is a super-2 number, since 2×43156644631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43156644931) 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, 1135701156 + ... + 1135701193.

It is an arithmetic number, because the mean of its divisors is an integer number (11357011750).

Almost surely, 2^43156644631 is an apocalyptic number.

43156644631 is a deficient number, since it is larger than the sum of its proper divisors (2271402369).

43156644631 is a wasteful number, since it uses less digits than its factorization.

43156644631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271402368.

The product of its digits is 622080, while the sum is 43.

The spelling of 43156644631 in words is "forty-three billion, one hundred fifty-six million, six hundred forty-four thousand, six hundred thirty-one".