40784657861 has 2 divisors, whose sum is σ = 40784657862. Its totient is φ = 40784657860.

The previous prime is 40784657843. The next prime is 40784657911. The reversal of 40784657861 is 16875648704.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33867408961 + 6917248900 = 184031^2 + 83170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40784657861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40784657797 and 40784657806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40784657801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20392328930 + 20392328931.

It is an arithmetic number, because the mean of its divisors is an integer number (20392328931).

Almost surely, 2^40784657861 is an apocalyptic number.

It is an amenable number.

40784657861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40784657861 is an equidigital number, since it uses as much as digits as its factorization.

40784657861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 40784657861 in words is "forty billion, seven hundred eighty-four million, six hundred fifty-seven thousand, eight hundred sixty-one".