640651608603 has 24 divisors (see below), whose sum is σ = 941759091936. Its totient is φ = 419586921600.

The previous prime is 640651608601. The next prime is 640651608637. The reversal of 640651608603 is 306806156046.

640651608603 is a `hidden beast` number, since 6 + 406 + 5 + 160 + 86 + 0 + 3 = 666.

640651608603 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640651608603 - 2¹ = 640651608601 is a prime.

It is a super-2 number, since 2×640651608603² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640651608601) 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, 1604400 + ... + 1963517.

It is an arithmetic number, because the mean of its divisors is an integer number (39239962164).

Almost surely, 2^640651608603 is an apocalyptic number.

640651608603 is a deficient number, since it is larger than the sum of its proper divisors (301107483333).

640651608603 is a wasteful number, since it uses less digits than its factorization.

640651608603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568275 (or 3568272 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 640651608603 in words is "six hundred forty billion, six hundred fifty-one million, six hundred eight thousand, six hundred three".