40412656561 has 4 divisors (see below), whose sum is σ = 40478155812. Its totient is φ = 40347157312.

The previous prime is 40412656541. The next prime is 40412656601. The reversal of 40412656561 is 16565621404.

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 2837160225 + 37575496336 = 53265^2 + 193844^2 .

It is a cyclic number.

It is not a de Polignac number, because 40412656561 - 2⁹ = 40412656049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40412656541) 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, 32748700 + ... + 32749933.

It is an arithmetic number, because the mean of its divisors is an integer number (10119538953).

Almost surely, 2^40412656561 is an apocalyptic number.

It is an amenable number.

40412656561 is a deficient number, since it is larger than the sum of its proper divisors (65499251).

40412656561 is an equidigital number, since it uses as much as digits as its factorization.

40412656561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65499250.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 40412656561 in words is "forty billion, four hundred twelve million, six hundred fifty-six thousand, five hundred sixty-one".