640254156206 has 8 divisors (see below), whose sum is σ = 1097578553520. Its totient is φ = 274394638368.

The previous prime is 640254156203. The next prime is 640254156229. The reversal of 640254156206 is 602651452046.

640254156206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640254156203) 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, 22866219851 + ... + 22866219878.

It is an arithmetic number, because the mean of its divisors is an integer number (137197319190).

Almost surely, 2^640254156206 is an apocalyptic number.

640254156206 is a deficient number, since it is larger than the sum of its proper divisors (457324397314).

640254156206 is a wasteful number, since it uses less digits than its factorization.

640254156206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45732439738.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 640254156206 in words is "six hundred forty billion, two hundred fifty-four million, one hundred fifty-six thousand, two hundred six".