640893686001 has 64 divisors (see below), whose sum is σ = 920630992896. Its totient is φ = 395792179200.

The previous prime is 640893685969. The next prime is 640893686023. The reversal of 640893686001 is 100686398046.

It is not a de Polignac number, because 640893686001 - 2⁵ = 640893685969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640893686101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 265819486 + ... + 265821896.

It is an arithmetic number, because the mean of its divisors is an integer number (14384859264).

Almost surely, 2^640893686001 is an apocalyptic number.

It is an amenable number.

640893686001 is a deficient number, since it is larger than the sum of its proper divisors (279737306895).

640893686001 is a wasteful number, since it uses less digits than its factorization.

640893686001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 640893686001 in words is "six hundred forty billion, eight hundred ninety-three million, six hundred eighty-six thousand, one".