40518438561 has 6 divisors (see below), whose sum is σ = 58526633490. Its totient is φ = 27012292368.

The previous prime is 40518438553. The next prime is 40518438601. The reversal of 40518438561 is 16583481504.

40518438561 is a `hidden beast` number, since 4 + 0 + 5 + 1 + 84 + 3 + 8 + 561 = 666.

40518438561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 32749778961 + 7768659600 = 180969^2 + 88140^2 .

It is not a de Polignac number, because 40518438561 - 2³ = 40518438553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40518438511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2251024356 + ... + 2251024373.

It is an arithmetic number, because the mean of its divisors is an integer number (9754438915).

Almost surely, 2^40518438561 is an apocalyptic number.

It is an amenable number.

40518438561 is a deficient number, since it is larger than the sum of its proper divisors (18008194929).

40518438561 is a wasteful number, since it uses less digits than its factorization.

40518438561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502048735 (or 4502048732 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 40518438561 in words is "forty billion, five hundred eighteen million, four hundred thirty-eight thousand, five hundred sixty-one".