61461144181 has 2 divisors, whose sum is σ = 61461144182. Its totient is φ = 61461144180.

The previous prime is 61461144167. The next prime is 61461144233. The reversal of 61461144181 is 18144116416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60992205156 + 468939025 = 246966^2 + 21655^2 .

It is a cyclic number.

It is not a de Polignac number, because 61461144181 - 2⁹ = 61461143669 is a prime.

It is a super-2 number, since 2×61461144181² (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 61461144181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61461142181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30730572090 + 30730572091.

It is an arithmetic number, because the mean of its divisors is an integer number (30730572091).

Almost surely, 2^61461144181 is an apocalyptic number.

It is an amenable number.

61461144181 is a deficient number, since it is larger than the sum of its proper divisors (1).

61461144181 is an equidigital number, since it uses as much as digits as its factorization.

61461144181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The spelling of 61461144181 in words is "sixty-one billion, four hundred sixty-one million, one hundred forty-four thousand, one hundred eighty-one".