81402380049 has 16 divisors (see below), whose sum is σ = 115995043008. Its totient is φ = 50598653952.

The previous prime is 81402379997. The next prime is 81402380053. The reversal of 81402380049 is 94008320418.

It is not a de Polignac number, because 81402380049 - 2⁹ = 81402379537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81402379989 and 81402380016.

It is not an unprimeable number, because it can be changed into a prime (81402380089) 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 15 ways as a sum of consecutive naturals, for example, 7453072 + ... + 7463985.

It is an arithmetic number, because the mean of its divisors is an integer number (7249690188).

Almost surely, 2^81402380049 is an apocalyptic number.

It is an amenable number.

81402380049 is a deficient number, since it is larger than the sum of its proper divisors (34592662959).

81402380049 is a wasteful number, since it uses less digits than its factorization.

81402380049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14917184.

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 81402380049 in words is "eighty-one billion, four hundred two million, three hundred eighty thousand, forty-nine".