40041255561 has 4 divisors (see below), whose sum is σ = 53388340752. Its totient is φ = 26694170372.

The previous prime is 40041255547. The next prime is 40041255601. The reversal of 40041255561 is 16555214004.

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.

It is a cyclic number.

It is not a de Polignac number, because 40041255561 - 2⁷ = 40041255433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40041255361) 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, 6673542591 + ... + 6673542596.

It is an arithmetic number, because the mean of its divisors is an integer number (13347085188).

Almost surely, 2^40041255561 is an apocalyptic number.

It is an amenable number.

40041255561 is a deficient number, since it is larger than the sum of its proper divisors (13347085191).

40041255561 is a wasteful number, since it uses less digits than its factorization.

40041255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347085190.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 40041255561 its reverse (16555214004), we get a palindrome (56596469565).

The spelling of 40041255561 in words is "forty billion, forty-one million, two hundred fifty-five thousand, five hundred sixty-one".