49557478181 has 2 divisors, whose sum is σ = 49557478182. Its totient is φ = 49557478180.

The previous prime is 49557478177. The next prime is 49557478207. The reversal of 49557478181 is 18187475594.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41205346081 + 8352132100 = 202991^2 + 91390^2 .

It is a cyclic number.

It is not a de Polignac number, because 49557478181 - 2² = 49557478177 is a prime.

It is a super-2 number, since 2×49557478181² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 49557478181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49557478171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24778739090 + 24778739091.

It is an arithmetic number, because the mean of its divisors is an integer number (24778739091).

Almost surely, 2^49557478181 is an apocalyptic number.

It is an amenable number.

49557478181 is a deficient number, since it is larger than the sum of its proper divisors (1).

49557478181 is an equidigital number, since it uses as much as digits as its factorization.

49557478181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 59.

The spelling of 49557478181 in words is "forty-nine billion, five hundred fifty-seven million, four hundred seventy-eight thousand, one hundred eighty-one".