40111712561 has 2 divisors, whose sum is σ = 40111712562. Its totient is φ = 40111712560.

The previous prime is 40111712521. The next prime is 40111712621. The reversal of 40111712561 is 16521711104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33112716961 + 6998995600 = 181969^2 + 83660^2 .

It is a cyclic number.

It is not a de Polignac number, because 40111712561 - 2²² = 40107518257 is a prime.

It is not a weakly prime, because it can be changed into another prime (40111712521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20055856280 + 20055856281.

It is an arithmetic number, because the mean of its divisors is an integer number (20055856281).

Almost surely, 2^40111712561 is an apocalyptic number.

It is an amenable number.

40111712561 is a deficient number, since it is larger than the sum of its proper divisors (1).

40111712561 is an equidigital number, since it uses as much as digits as its factorization.

40111712561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 29.

The spelling of 40111712561 in words is "forty billion, one hundred eleven million, seven hundred twelve thousand, five hundred sixty-one".