49722447891 has 16 divisors (see below), whose sum is σ = 68110377984. Its totient is φ = 32241986784.

The previous prime is 49722447877. The next prime is 49722447899. The reversal of 49722447891 is 19874422794.

It is not a de Polignac number, because 49722447891 - 2²¹ = 49720350739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (49722447899) 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, 280816 + ... + 422258.

It is an arithmetic number, because the mean of its divisors is an integer number (4256898624).

Almost surely, 2^49722447891 is an apocalyptic number.

49722447891 is a deficient number, since it is larger than the sum of its proper divisors (18387930093).

49722447891 is a wasteful number, since it uses less digits than its factorization.

49722447891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144650.

The product of its digits is 8128512, while the sum is 57.

The spelling of 49722447891 in words is "forty-nine billion, seven hundred twenty-two million, four hundred forty-seven thousand, eight hundred ninety-one".