40857749689 has 9 divisors (see below), whose sum is σ = 41198722149. Its totient is φ = 40519581180.

The previous prime is 40857749659. The next prime is 40857749729. The reversal of 40857749689 is 98694775804.

The square root of 40857749689 is 202133.

It is a perfect power (a square), and thus also a powerful number.

40857749689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40857749689 - 2¹⁹ = 40857225401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40857749659) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26478652 + ... + 26480194.

Almost surely, 2^40857749689 is an apocalyptic number.

40857749689 is the 202133-rd square number.

40857749689 is the 101067-th centered octagonal number.

It is an amenable number.

40857749689 is a deficient number, since it is larger than the sum of its proper divisors (340972460).

40857749689 is an frugal number, since it uses more digits than its factorization.

40857749689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 67.

The spelling of 40857749689 in words is "forty billion, eight hundred fifty-seven million, seven hundred forty-nine thousand, six hundred eighty-nine".