40166794861 has 2 divisors, whose sum is σ = 40166794862. Its totient is φ = 40166794860.

The previous prime is 40166794859. The next prime is 40166794919. The reversal of 40166794861 is 16849766104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28356539236 + 11810255625 = 168394^2 + 108675^2 .

It is a cyclic number.

It is not a de Polignac number, because 40166794861 - 2¹ = 40166794859 is a prime.

It is a super-2 number, since 2×40166794861² (a number of 22 digits) contains 22 as substring.

Together with 40166794859, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40166794799 and 40166794808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40166795861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20083397430 + 20083397431.

It is an arithmetic number, because the mean of its divisors is an integer number (20083397431).

Almost surely, 2^40166794861 is an apocalyptic number.

It is an amenable number.

40166794861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40166794861 is an equidigital number, since it uses as much as digits as its factorization.

40166794861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 40166794861 in words is "forty billion, one hundred sixty-six million, seven hundred ninety-four thousand, eight hundred sixty-one".