640540336546 has 16 divisors (see below), whose sum is σ = 1048215598848. Its totient is φ = 291138397200.

The previous prime is 640540336543. The next prime is 640540336589. The reversal of 640540336546 is 645633045046.

It is a junction number, because it is equal to n+sod(n) for n = 640540336496 and 640540336505.

It is not an unprimeable number, because it can be changed into a prime (640540336543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408690 + ... + 1203373.

It is an arithmetic number, because the mean of its divisors is an integer number (65513474928).

Almost surely, 2^640540336546 is an apocalyptic number.

640540336546 is a deficient number, since it is larger than the sum of its proper divisors (407675262302).

640540336546 is a wasteful number, since it uses less digits than its factorization.

640540336546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630137.

The product of its (nonzero) digits is 3110400, while the sum is 46.

The spelling of 640540336546 in words is "six hundred forty billion, five hundred forty million, three hundred thirty-six thousand, five hundred forty-six".