50261397681 has 16 divisors (see below), whose sum is σ = 74108963520. Its totient is φ = 30044171520.

The previous prime is 50261397677. The next prime is 50261397721. The reversal of 50261397681 is 18679316205.

It is not a de Polignac number, because 50261397681 - 2² = 50261397677 is a prime.

It is a super-2 number, since 2×50261397681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 50261397681.

It is not an unprimeable number, because it can be changed into a prime (50261397601) 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, 10429596 + ... + 10434413.

It is an arithmetic number, because the mean of its divisors is an integer number (4631810220).

Almost surely, 2^50261397681 is an apocalyptic number.

It is an amenable number.

50261397681 is a deficient number, since it is larger than the sum of its proper divisors (23847565839).

50261397681 is a wasteful number, since it uses less digits than its factorization.

50261397681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20864096.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 50261397681 in words is "fifty billion, two hundred sixty-one million, three hundred ninety-seven thousand, six hundred eighty-one".