40646627881 has 4 divisors (see below), whose sum is σ = 40662138564. Its totient is φ = 40631117200.

The previous prime is 40646627863. The next prime is 40646627891. The reversal of 40646627881 is 18872664604.

40646627881 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.

It can be written as a sum of positive squares in 2 ways, for example, as 36229696281 + 4416931600 = 190341^2 + 66460^2 .

It is a cyclic number.

It is not a de Polignac number, because 40646627881 - 2⁷ = 40646627753 is a prime.

It is a super-2 number, since 2×40646627881² (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 (40646627831) 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, 7751410 + ... + 7756651.

It is an arithmetic number, because the mean of its divisors is an integer number (10165534641).

Almost surely, 2^40646627881 is an apocalyptic number.

It is an amenable number.

40646627881 is a deficient number, since it is larger than the sum of its proper divisors (15510683).

40646627881 is a wasteful number, since it uses less digits than its factorization.

40646627881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15510682.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 40646627881 in words is "forty billion, six hundred forty-six million, six hundred twenty-seven thousand, eight hundred eighty-one".