49661591689 has 2 divisors, whose sum is σ = 49661591690. Its totient is φ = 49661591688.

The previous prime is 49661591669. The next prime is 49661591701. The reversal of 49661591689 is 98619516694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26721460089 + 22940131600 = 163467^2 + 151460^2 .

It is a cyclic number.

It is not a de Polignac number, because 49661591689 - 2⁵ = 49661591657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49661591689.

It is not a weakly prime, because it can be changed into another prime (49661591669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24830795844 + 24830795845.

It is an arithmetic number, because the mean of its divisors is an integer number (24830795845).

Almost surely, 2^49661591689 is an apocalyptic number.

It is an amenable number.

49661591689 is a deficient number, since it is larger than the sum of its proper divisors (1).

49661591689 is an equidigital number, since it uses as much as digits as its factorization.

49661591689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 64.

The spelling of 49661591689 in words is "forty-nine billion, six hundred sixty-one million, five hundred ninety-one thousand, six hundred eighty-nine".