49775721617 has 2 divisors, whose sum is σ = 49775721618. Its totient is φ = 49775721616.

The previous prime is 49775721577. The next prime is 49775721623. The reversal of 49775721617 is 71612757794.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48936518656 + 839202961 = 221216^2 + 28969^2 .

It is a cyclic number.

It is not a de Polignac number, because 49775721617 - 2⁶ = 49775721553 is a prime.

It is not a weakly prime, because it can be changed into another prime (49775711617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24887860808 + 24887860809.

It is an arithmetic number, because the mean of its divisors is an integer number (24887860809).

Almost surely, 2^49775721617 is an apocalyptic number.

It is an amenable number.

49775721617 is a deficient number, since it is larger than the sum of its proper divisors (1).

49775721617 is an equidigital number, since it uses as much as digits as its factorization.

49775721617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5186160, while the sum is 56.

The spelling of 49775721617 in words is "forty-nine billion, seven hundred seventy-five million, seven hundred twenty-one thousand, six hundred seventeen".