640816611950 has 24 divisors (see below), whose sum is σ = 1233019552680. Its totient is φ = 247487794400.

The previous prime is 640816611943. The next prime is 640816611959. The reversal of 640816611950 is 59116618046.

It is a junction number, because it is equal to n+sod(n) for n = 640816611895 and 640816611904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640816611959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220969796 + ... + 220972695.

It is an arithmetic number, because the mean of its divisors is an integer number (51375814695).

Almost surely, 2^640816611950 is an apocalyptic number.

640816611950 is a deficient number, since it is larger than the sum of its proper divisors (592202940730).

640816611950 is a wasteful number, since it uses less digits than its factorization.

640816611950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441942532 (or 441942527 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 640816611950 in words is "six hundred forty billion, eight hundred sixteen million, six hundred eleven thousand, nine hundred fifty".