40631550561 has 56 divisors (see below), whose sum is σ = 69763479360. Its totient is φ = 23170932576.

The previous prime is 40631550529. The next prime is 40631550577. The reversal of 40631550561 is 16505513604.

40631550561 is a `hidden beast` number, since 40 + 6 + 3 + 1 + 5 + 50 + 561 = 666.

It is not a de Polignac number, because 40631550561 - 2⁵ = 40631550529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40631550581) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 2589606 + ... + 2605248.

Almost surely, 2^40631550561 is an apocalyptic number.

It is an amenable number.

40631550561 is a deficient number, since it is larger than the sum of its proper divisors (29131928799).

40631550561 is an equidigital number, since it uses as much as digits as its factorization.

40631550561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16177 (or 16162 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 40631550561 in words is "forty billion, six hundred thirty-one million, five hundred fifty thousand, five hundred sixty-one".