40205735861 has 2 divisors, whose sum is σ = 40205735862. Its totient is φ = 40205735860.

The previous prime is 40205735839. The next prime is 40205735891. The reversal of 40205735861 is 16853750204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24275509636 + 15930226225 = 155806^2 + 126215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40205735861 is a prime.

It is a super-2 number, since 2×40205735861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40205735831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102867930 + 20102867931.

It is an arithmetic number, because the mean of its divisors is an integer number (20102867931).

Almost surely, 2^40205735861 is an apocalyptic number.

It is an amenable number.

40205735861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40205735861 is an equidigital number, since it uses as much as digits as its factorization.

40205735861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 40205735861 in words is "forty billion, two hundred five million, seven hundred thirty-five thousand, eight hundred sixty-one".