49784621561 has 2 divisors, whose sum is σ = 49784621562. Its totient is φ = 49784621560.

The previous prime is 49784621543. The next prime is 49784621569. The reversal of 49784621561 is 16512648794.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41884078336 + 7900543225 = 204656^2 + 88885^2 .

It is a cyclic number.

It is not a de Polignac number, because 49784621561 - 2¹⁴ = 49784605177 is a prime.

It is not a weakly prime, because it can be changed into another prime (49784621569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24892310780 + 24892310781.

It is an arithmetic number, because the mean of its divisors is an integer number (24892310781).

Almost surely, 2^49784621561 is an apocalyptic number.

It is an amenable number.

49784621561 is a deficient number, since it is larger than the sum of its proper divisors (1).

49784621561 is an equidigital number, since it uses as much as digits as its factorization.

49784621561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 49784621561 in words is "forty-nine billion, seven hundred eighty-four million, six hundred twenty-one thousand, five hundred sixty-one".