640168000787 has 16 divisors (see below), whose sum is σ = 770155372800. Its totient is φ = 519816463200.

The previous prime is 640168000781. The next prime is 640168000817. The reversal of 640168000787 is 787000861046.

It is a cyclic number.

It is not a de Polignac number, because 640168000787 - 2²⁴ = 640151223571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640168000781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4356764 + ... + 4501302.

It is an arithmetic number, because the mean of its divisors is an integer number (48134710800).

Almost surely, 2^640168000787 is an apocalyptic number.

640168000787 is a deficient number, since it is larger than the sum of its proper divisors (129987372013).

640168000787 is a wasteful number, since it uses less digits than its factorization.

640168000787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177866.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 640168000787 in words is "six hundred forty billion, one hundred sixty-eight million, seven hundred eighty-seven", and thus it is an aban number.