40221112661 has 2 divisors, whose sum is σ = 40221112662. Its totient is φ = 40221112660.

The previous prime is 40221112579. The next prime is 40221112681. The reversal of 40221112661 is 16621112204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25922932036 + 14298180625 = 161006^2 + 119575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40221112661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40221112661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40221112681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110556330 + 20110556331.

It is an arithmetic number, because the mean of its divisors is an integer number (20110556331).

Almost surely, 2^40221112661 is an apocalyptic number.

It is an amenable number.

40221112661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40221112661 is an equidigital number, since it uses as much as digits as its factorization.

40221112661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

Adding to 40221112661 its reverse (16621112204), we get a palindrome (56842224865).

The spelling of 40221112661 in words is "forty billion, two hundred twenty-one million, one hundred twelve thousand, six hundred sixty-one".