49857405721 has 2 divisors, whose sum is σ = 49857405722. Its totient is φ = 49857405720.

The previous prime is 49857405683. The next prime is 49857405733. The reversal of 49857405721 is 12750475894.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45203437321 + 4653968400 = 212611^2 + 68220^2 .

It is a cyclic number.

It is not a de Polignac number, because 49857405721 - 2¹³ = 49857397529 is a prime.

It is not a weakly prime, because it can be changed into another prime (49857405751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24928702860 + 24928702861.

It is an arithmetic number, because the mean of its divisors is an integer number (24928702861).

Almost surely, 2^49857405721 is an apocalyptic number.

It is an amenable number.

49857405721 is a deficient number, since it is larger than the sum of its proper divisors (1).

49857405721 is an equidigital number, since it uses as much as digits as its factorization.

49857405721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 49857405721 in words is "forty-nine billion, eight hundred fifty-seven million, four hundred five thousand, seven hundred twenty-one".