640266351 has 24 divisors (see below), whose sum is σ = 905859504. Its totient is φ = 402192000.

The previous prime is 640266331. The next prime is 640266377. The reversal of 640266351 is 153662046.

640266351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640266351 - 2⁹ = 640265839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640266301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 211851 + ... + 214851.

It is an arithmetic number, because the mean of its divisors is an integer number (37744146).

Almost surely, 2^640266351 is an apocalyptic number.

640266351 is a deficient number, since it is larger than the sum of its proper divisors (265593153).

640266351 is a wasteful number, since it uses less digits than its factorization.

640266351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239 (or 3220 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 640266351 is about 25303.4849576101. The cubic root of 640266351 is about 861.8934085643.

The spelling of 640266351 in words is "six hundred forty million, two hundred sixty-six thousand, three hundred fifty-one".