49291128665 has 4 divisors (see below), whose sum is σ = 59149354404. Its totient is φ = 39432902928.

The previous prime is 49291128661. The next prime is 49291128671. The reversal of 49291128665 is 56682119294.

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 19760768329 + 29530360336 = 140573^2 + 171844^2 .

It is a cyclic number.

It is not a de Polignac number, because 49291128665 - 2² = 49291128661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49291128661) 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, 4929112862 + ... + 4929112871.

It is an arithmetic number, because the mean of its divisors is an integer number (14787338601).

Almost surely, 2^49291128665 is an apocalyptic number.

It is an amenable number.

49291128665 is a deficient number, since it is larger than the sum of its proper divisors (9858225739).

49291128665 is an equidigital number, since it uses as much as digits as its factorization.

49291128665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9858225738.

The product of its digits is 1866240, while the sum is 53.

The spelling of 49291128665 in words is "forty-nine billion, two hundred ninety-one million, one hundred twenty-eight thousand, six hundred sixty-five".