40643531816 has 8 divisors (see below), whose sum is σ = 76206622170. Its totient is φ = 20321765904.

The previous prime is 40643531777. The next prime is 40643531837. The reversal of 40643531816 is 61813534604.

It can be written as a sum of positive squares in only one way, i.e., 31965864100 + 8677667716 = 178790^2 + 93154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540220731 + ... + 2540220746.

Almost surely, 2^40643531816 is an apocalyptic number.

It is an amenable number.

40643531816 is a deficient number, since it is larger than the sum of its proper divisors (35563090354).

40643531816 is a wasteful number, since it uses less digits than its factorization.

40643531816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080441483 (or 5080441479 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 40643531816 in words is "forty billion, six hundred forty-three million, five hundred thirty-one thousand, eight hundred sixteen".