40075645681 has 4 divisors (see below), whose sum is σ = 40076107632. Its totient is φ = 40075183732.

The previous prime is 40075645669. The next prime is 40075645697. The reversal of 40075645681 is 18654657004.

40075645681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40075645681 - 2⁷ = 40075645553 is a prime.

It is a super-2 number, since 2×40075645681² (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 (40075645601) 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, 57331 + ... + 288856.

It is an arithmetic number, because the mean of its divisors is an integer number (10019026908).

Almost surely, 2^40075645681 is an apocalyptic number.

It is an amenable number.

40075645681 is a deficient number, since it is larger than the sum of its proper divisors (461951).

40075645681 is a wasteful number, since it uses less digits than its factorization.

40075645681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461950.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 40075645681 in words is "forty billion, seventy-five million, six hundred forty-five thousand, six hundred eighty-one".