40187745866 has 16 divisors (see below), whose sum is σ = 61737575328. Its totient is φ = 19613583600.

The previous prime is 40187745821. The next prime is 40187745883. The reversal of 40187745866 is 66854778104.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241300 + ... + 1273263.

It is an arithmetic number, because the mean of its divisors is an integer number (3858598458).

Almost surely, 2^40187745866 is an apocalyptic number.

40187745866 is a deficient number, since it is larger than the sum of its proper divisors (21549829462).

40187745866 is a wasteful number, since it uses less digits than its factorization.

40187745866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514757.

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

The spelling of 40187745866 in words is "forty billion, one hundred eighty-seven million, seven hundred forty-five thousand, eight hundred sixty-six".