50781437689 has 4 divisors (see below), whose sum is σ = 50785894656. Its totient is φ = 50776980724.

The previous prime is 50781437671. The next prime is 50781437699. The reversal of 50781437689 is 98673418705.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50781437689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50781437699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2211349 + ... + 2234194.

It is an arithmetic number, because the mean of its divisors is an integer number (12696473664).

Almost surely, 2^50781437689 is an apocalyptic number.

It is an amenable number.

50781437689 is a deficient number, since it is larger than the sum of its proper divisors (4456967).

50781437689 is a wasteful number, since it uses less digits than its factorization.

50781437689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456966.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 50781437689 in words is "fifty billion, seven hundred eighty-one million, four hundred thirty-seven thousand, six hundred eighty-nine".