40405861081 has 2 divisors, whose sum is σ = 40405861082. Its totient is φ = 40405861080.

The previous prime is 40405861043. The next prime is 40405861091. The reversal of 40405861081 is 18016850404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23618771856 + 16787089225 = 153684^2 + 129565^2 .

It is a cyclic number.

It is not a de Polignac number, because 40405861081 - 2⁷ = 40405860953 is a prime.

It is a super-2 number, since 2×40405861081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40405861081.

It is not a weakly prime, because it can be changed into another prime (40405861091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202930540 + 20202930541.

It is an arithmetic number, because the mean of its divisors is an integer number (20202930541).

Almost surely, 2^40405861081 is an apocalyptic number.

It is an amenable number.

40405861081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405861081 is an equidigital number, since it uses as much as digits as its factorization.

40405861081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 40405861081 in words is "forty billion, four hundred five million, eight hundred sixty-one thousand, eighty-one".