40685783657 has 2 divisors, whose sum is σ = 40685783658. Its totient is φ = 40685783656.

The previous prime is 40685783597. The next prime is 40685783669. The reversal of 40685783657 is 75638758604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40405422121 + 280361536 = 201011^2 + 16744^2 .

It is a cyclic number.

It is not a de Polignac number, because 40685783657 - 2²⁰ = 40684735081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40685783596 and 40685783605.

It is not a weakly prime, because it can be changed into another prime (40685786657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342891828 + 20342891829.

It is an arithmetic number, because the mean of its divisors is an integer number (20342891829).

Almost surely, 2^40685783657 is an apocalyptic number.

It is an amenable number.

40685783657 is a deficient number, since it is larger than the sum of its proper divisors (1).

40685783657 is an equidigital number, since it uses as much as digits as its factorization.

40685783657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33868800, while the sum is 59.

The spelling of 40685783657 in words is "forty billion, six hundred eighty-five million, seven hundred eighty-three thousand, six hundred fifty-seven".