49971137561 has 2 divisors, whose sum is σ = 49971137562. Its totient is φ = 49971137560.

The previous prime is 49971137533. The next prime is 49971137677. The reversal of 49971137561 is 16573117994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31949417536 + 18021720025 = 178744^2 + 134245^2 .

It is a cyclic number.

It is not a de Polignac number, because 49971137561 - 2⁶ = 49971137497 is a prime.

It is a super-2 number, since 2×49971137561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (49971137501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24985568780 + 24985568781.

It is an arithmetic number, because the mean of its divisors is an integer number (24985568781).

Almost surely, 2^49971137561 is an apocalyptic number.

It is an amenable number.

49971137561 is a deficient number, since it is larger than the sum of its proper divisors (1).

49971137561 is an equidigital number, since it uses as much as digits as its factorization.

49971137561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 53.

The spelling of 49971137561 in words is "forty-nine billion, nine hundred seventy-one million, one hundred thirty-seven thousand, five hundred sixty-one".