49851983721 has 4 divisors (see below), whose sum is σ = 66469311632. Its totient is φ = 33234655812.

The previous prime is 49851983663. The next prime is 49851983729. The reversal of 49851983721 is 12738915894.

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 not a de Polignac number, because 49851983721 - 2²⁶ = 49784874857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49851983729) 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, 8308663951 + ... + 8308663956.

It is an arithmetic number, because the mean of its divisors is an integer number (16617327908).

Almost surely, 2^49851983721 is an apocalyptic number.

It is an amenable number.

49851983721 is a deficient number, since it is larger than the sum of its proper divisors (16617327911).

49851983721 is a wasteful number, since it uses less digits than its factorization.

49851983721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16617327910.

The product of its digits is 4354560, while the sum is 57.

The spelling of 49851983721 in words is "forty-nine billion, eight hundred fifty-one million, nine hundred eighty-three thousand, seven hundred twenty-one".