49721795861 has 4 divisors (see below), whose sum is σ = 49723278252. Its totient is φ = 49720313472.

The previous prime is 49721795831. The next prime is 49721795927. The reversal of 49721795861 is 16859712794.

49721795861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39523825636 + 10197970225 = 198806^2 + 100985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49721795861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 49721795861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49721795831) 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, 689690 + ... + 758363.

It is an arithmetic number, because the mean of its divisors is an integer number (12430819563).

Almost surely, 2^49721795861 is an apocalyptic number.

It is an amenable number.

49721795861 is a deficient number, since it is larger than the sum of its proper divisors (1482391).

49721795861 is a wasteful number, since it uses less digits than its factorization.

49721795861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482390.

The product of its digits is 7620480, while the sum is 59.

The spelling of 49721795861 in words is "forty-nine billion, seven hundred twenty-one million, seven hundred ninety-five thousand, eight hundred sixty-one".