640654605351 has 6 divisors (see below), whose sum is σ = 925389985520. Its totient is φ = 427103070228.

The previous prime is 640654605329. The next prime is 640654605389. The reversal of 640654605351 is 153506456046.

640654605351 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 5 + 4 + 605 + 35 + 1 = 666.

It is not a de Polignac number, because 640654605351 - 2⁵ = 640654605319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640654605297 and 640654605306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640654605301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35591922511 + ... + 35591922528.

Almost surely, 2^640654605351 is an apocalyptic number.

640654605351 is a deficient number, since it is larger than the sum of its proper divisors (284735380169).

640654605351 is a wasteful number, since it uses less digits than its factorization.

640654605351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71183845045 (or 71183845042 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 640654605351 in words is "six hundred forty billion, six hundred fifty-four million, six hundred five thousand, three hundred fifty-one".