640143336526 has 16 divisors (see below), whose sum is σ = 1011381701760. Its totient is φ = 303037071480.

The previous prime is 640143336493. The next prime is 640143336557. The reversal of 640143336526 is 625633341046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180340 + ... + 5302471.

It is an arithmetic number, because the mean of its divisors is an integer number (63211356360).

Almost surely, 2^640143336526 is an apocalyptic number.

640143336526 is a deficient number, since it is larger than the sum of its proper divisors (371238365234).

640143336526 is a wasteful number, since it uses less digits than its factorization.

640143336526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10484439.

The product of its (nonzero) digits is 933120, while the sum is 43.

The spelling of 640143336526 in words is "six hundred forty billion, one hundred forty-three million, three hundred thirty-six thousand, five hundred twenty-six".