40649237018 has 8 divisors (see below), whose sum is σ = 65664152148. Its totient is φ = 18761186304.

The previous prime is 40649237017. The next prime is 40649237023. The reversal of 40649237018 is 81073294604.

It can be written as a sum of positive squares in 2 ways, for example, as 39614135089 + 1035101929 = 199033^2 + 32173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40649237018.

It is not an unprimeable number, because it can be changed into a prime (40649237017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781716071 + ... + 781716122.

Almost surely, 2^40649237018 is an apocalyptic number.

40649237018 is a deficient number, since it is larger than the sum of its proper divisors (25014915130).

40649237018 is a wasteful number, since it uses less digits than its factorization.

40649237018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563432208.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 40649237018 in words is "forty billion, six hundred forty-nine million, two hundred thirty-seven thousand, eighteen".