50640697887 has 16 divisors (see below), whose sum is σ = 72814909440. Its totient is φ = 31120623072.

The previous prime is 50640697873. The next prime is 50640697889. The reversal of 50640697887 is 78879604605.

It is not a de Polignac number, because 50640697887 - 2¹² = 50640693791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 50640697887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50640697889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864687 + ... + 921392.

It is an arithmetic number, because the mean of its divisors is an integer number (4550931840).

Almost surely, 2^50640697887 is an apocalyptic number.

50640697887 is a deficient number, since it is larger than the sum of its proper divisors (22174211553).

50640697887 is a wasteful number, since it uses less digits than its factorization.

50640697887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786822.

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 50640697887 in words is "fifty billion, six hundred forty million, six hundred ninety-seven thousand, eight hundred eighty-seven".