640546645046 has 48 divisors (see below), whose sum is σ = 1207155156480. Its totient is φ = 249527506800.

The previous prime is 640546645033. The next prime is 640546645073.

640546645046 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 640546644985 and 640546645003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13716725 + ... + 13763343.

It is an arithmetic number, because the mean of its divisors is an integer number (25149065760).

Almost surely, 2^640546645046 is an apocalyptic number.

640546645046 is a deficient number, since it is larger than the sum of its proper divisors (566608511434).

640546645046 is a wasteful number, since it uses less digits than its factorization.

640546645046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54761 (or 54750 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 50.

The spelling of 640546645046 in words is "six hundred forty billion, five hundred forty-six million, six hundred forty-five thousand, forty-six".