40686607693 has 4 divisors (see below), whose sum is σ = 40748161468. Its totient is φ = 40625053920.

The previous prime is 40686607691. The next prime is 40686607699. The reversal of 40686607693 is 39670668604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19065257929 + 21621349764 = 138077^2 + 147042^2 .

It is a cyclic number.

It is not a de Polignac number, because 40686607693 - 2¹ = 40686607691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40686607691) 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 in 3 ways as a sum of consecutive naturals, for example, 30775896 + ... + 30777217.

It is an arithmetic number, because the mean of its divisors is an integer number (10187040367).

Almost surely, 2^40686607693 is an apocalyptic number.

It is an amenable number.

40686607693 is a deficient number, since it is larger than the sum of its proper divisors (61553775).

40686607693 is an equidigital number, since it uses as much as digits as its factorization.

40686607693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61553774.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 40686607693 in words is "forty billion, six hundred eighty-six million, six hundred seven thousand, six hundred ninety-three".