61611325281 has 24 divisors (see below), whose sum is σ = 97390822464. Its totient is φ = 37222385760.

The previous prime is 61611325277. The next prime is 61611325283. The reversal of 61611325281 is 18252311616.

61611325281 is a `hidden beast` number, since 6 + 1 + 611 + 32 + 5 + 2 + 8 + 1 = 666.

It is not a de Polignac number, because 61611325281 - 2² = 61611325277 is a prime.

It is a super-2 number, since 2×61611325281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61611325283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 950221 + ... + 1012986.

It is an arithmetic number, because the mean of its divisors is an integer number (4057950936).

Almost surely, 2^61611325281 is an apocalyptic number.

It is an amenable number.

61611325281 is a deficient number, since it is larger than the sum of its proper divisors (35779497183).

61611325281 is a wasteful number, since it uses less digits than its factorization.

61611325281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963541 (or 1963538 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

Adding to 61611325281 its reverse (18252311616), we get a palindrome (79863636897).

The spelling of 61611325281 in words is "sixty-one billion, six hundred eleven million, three hundred twenty-five thousand, two hundred eighty-one".