40244791681 has 4 divisors (see below), whose sum is σ = 40252357552. Its totient is φ = 40237225812.

The previous prime is 40244791669. The next prime is 40244791693. The reversal of 40244791681 is 18619744204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40244791669) and next prime (40244791693).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40244791681 is a prime.

It is a super-2 number, since 2×40244791681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40244711681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3774951 + ... + 3785596.

It is an arithmetic number, because the mean of its divisors is an integer number (10063089388).

Almost surely, 2^40244791681 is an apocalyptic number.

It is an amenable number.

40244791681 is a deficient number, since it is larger than the sum of its proper divisors (7565871).

40244791681 is an equidigital number, since it uses as much as digits as its factorization.

40244791681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7565870.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 40244791681 in words is "forty billion, two hundred forty-four million, seven hundred ninety-one thousand, six hundred eighty-one".