61641288989281 has 8 divisors (see below), whose sum is σ = 62940567196584. Its totient is φ = 60347056523520.

The previous prime is 61641288989237. The next prime is 61641288989317. The reversal of 61641288989281 is 18298988214616.

61641288989281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5653243299025 + 55988045690256 = 2377655^2 + 7482516^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61641288989281 - 2¹³ = 61641288981089 is a prime.

It is a super-2 number, since 2×61641288989281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61641288981281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261410696 + ... + 1261459561.

It is an arithmetic number, because the mean of its divisors is an integer number (7867570899573).

Almost surely, 2^{61641288989281} is an apocalyptic number.

It is an amenable number.

61641288989281 is a deficient number, since it is larger than the sum of its proper divisors (1299278207303).

61641288989281 is a wasteful number, since it uses less digits than its factorization.

61641288989281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522870771.

The product of its digits is 191102976, while the sum is 73.

The spelling of 61641288989281 in words is "sixty-one trillion, six hundred forty-one billion, two hundred eighty-eight million, nine hundred eighty-nine thousand, two hundred eighty-one".