40511552561 has 8 divisors (see below), whose sum is σ = 40636161384. Its totient is φ = 40387057920.

The previous prime is 40511552539. The next prime is 40511552591. The reversal of 40511552561 is 16525511504.

It can be written as a sum of positive squares in 4 ways, for example, as 493950625 + 40017601936 = 22225^2 + 200044^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40511552561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40511552591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711401 + ... + 766233.

It is an arithmetic number, because the mean of its divisors is an integer number (5079520173).

Almost surely, 2^40511552561 is an apocalyptic number.

It is an amenable number.

40511552561 is a deficient number, since it is larger than the sum of its proper divisors (124608823).

40511552561 is a wasteful number, since it uses less digits than its factorization.

40511552561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57091.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 40511552561 in words is "forty billion, five hundred eleven million, five hundred fifty-two thousand, five hundred sixty-one".