61081868005 has 8 divisors (see below), whose sum is σ = 73371766392. Its totient is φ = 48816477888.

The previous prime is 61081867991. The next prime is 61081868017. The reversal of 61081868005 is 50086818016.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27344260321 + 33737607684 = 165361^2 + 183678^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61081868005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 6121582 + ... + 6131551.

It is an arithmetic number, because the mean of its divisors is an integer number (9171470799).

Almost surely, 2^61081868005 is an apocalyptic number.

It is an amenable number.

61081868005 is a deficient number, since it is larger than the sum of its proper divisors (12289898387).

61081868005 is a wasteful number, since it uses less digits than its factorization.

61081868005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12254135.

The product of its (nonzero) digits is 92160, while the sum is 43.

The spelling of 61081868005 in words is "sixty-one billion, eighty-one million, eight hundred sixty-eight thousand, five".