61181131082621 has 12 divisors (see below), whose sum is σ = 67372985746332. Its totient is φ = 55516401864000.

The previous prime is 61181131082557. The next prime is 61181131082693. The reversal of 61181131082621 is 12628013118116.

It can be written as a sum of positive squares in 2 ways, for example, as 13034338296100 + 48146792786521 = 3610310^2 + 6938789^2 .

It is not a de Polignac number, because 61181131082621 - 2⁶ = 61181131082557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61181131081621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467244320 + ... + 467375241.

It is an arithmetic number, because the mean of its divisors is an integer number (5614415478861).

Almost surely, 2^{61181131082621} is an apocalyptic number.

It is an amenable number.

61181131082621 is a deficient number, since it is larger than the sum of its proper divisors (6191854663711).

61181131082621 is a wasteful number, since it uses less digits than its factorization.

61181131082621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934620124 (or 934620113 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The spelling of 61181131082621 in words is "sixty-one trillion, one hundred eighty-one billion, one hundred thirty-one million, eighty-two thousand, six hundred twenty-one".