640210077618 has 16 divisors (see below), whose sum is σ = 1336090597056. Its totient is φ = 204124952240.

The previous prime is 640210077613. The next prime is 640210077623. The reversal of 640210077618 is 816770012046.

It is an interprime number because it is at equal distance from previous prime (640210077613) and next prime (640210077623).

It is a self number, because there is not a number n which added to its sum of digits gives 640210077618.

It is not an unprimeable number, because it can be changed into a prime (640210077613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2319601593 + ... + 2319601868.

It is an arithmetic number, because the mean of its divisors is an integer number (83505662316).

Almost surely, 2^640210077618 is an apocalyptic number.

640210077618 is an abundant number, since it is smaller than the sum of its proper divisors (695880519438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640210077618 is a wasteful number, since it uses less digits than its factorization.

640210077618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639203489.

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 640210077618 in words is "six hundred forty billion, two hundred ten million, seventy-seven thousand, six hundred eighteen".