40518244537 has 4 divisors (see below), whose sum is σ = 41182478116. Its totient is φ = 39854010960.

The previous prime is 40518244511. The next prime is 40518244577. The reversal of 40518244537 is 73544281504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21625467136 + 18892777401 = 147056^2 + 137451^2 .

It is a cyclic number.

It is not a de Polignac number, because 40518244537 - 2⁷ = 40518244409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40518244493 and 40518244502.

It is not an unprimeable number, because it can be changed into a prime (40518244577) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 332116698 + ... + 332116819.

It is an arithmetic number, because the mean of its divisors is an integer number (10295619529).

Almost surely, 2^40518244537 is an apocalyptic number.

It is an amenable number.

40518244537 is a deficient number, since it is larger than the sum of its proper divisors (664233579).

40518244537 is an equidigital number, since it uses as much as digits as its factorization.

40518244537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664233578.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 40518244537 in words is "forty billion, five hundred eighteen million, two hundred forty-four thousand, five hundred thirty-seven".