49579897561 has 2 divisors, whose sum is σ = 49579897562. Its totient is φ = 49579897560.

The previous prime is 49579897559. The next prime is 49579897597. The reversal of 49579897561 is 16579897594.

49579897561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48726147600 + 853749961 = 220740^2 + 29219^2 .

It is a cyclic number.

It is not a de Polignac number, because 49579897561 - 2¹ = 49579897559 is a prime.

Together with 49579897559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (49579897511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24789948780 + 24789948781.

It is an arithmetic number, because the mean of its divisors is an integer number (24789948781).

Almost surely, 2^49579897561 is an apocalyptic number.

It is an amenable number.

49579897561 is a deficient number, since it is larger than the sum of its proper divisors (1).

49579897561 is an equidigital number, since it uses as much as digits as its factorization.

49579897561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171460800, while the sum is 70.

The spelling of 49579897561 in words is "forty-nine billion, five hundred seventy-nine million, eight hundred ninety-seven thousand, five hundred sixty-one".