49747795685821 has 4 divisors (see below), whose sum is σ = 49823057102044. Its totient is φ = 49672534269600.

The previous prime is 49747795685813. The next prime is 49747795685831. The reversal of 49747795685821 is 12858659774794.

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 45725320202500 + 4022475483321 = 6762050^2 + 2005611^2 .

It is a cyclic number.

It is not a de Polignac number, because 49747795685821 - 2³ = 49747795685813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49747795685831) 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, 37630707120 + ... + 37630708441.

It is an arithmetic number, because the mean of its divisors is an integer number (12455764275511).

Almost surely, 2^{49747795685821} is an apocalyptic number.

It is an amenable number.

49747795685821 is a deficient number, since it is larger than the sum of its proper divisors (75261416223).

49747795685821 is an equidigital number, since it uses as much as digits as its factorization.

49747795685821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75261416222.

The product of its digits is 8534937600, while the sum is 82.

The spelling of 49747795685821 in words is "forty-nine trillion, seven hundred forty-seven billion, seven hundred ninety-five million, six hundred eighty-five thousand, eight hundred twenty-one".