81604465747 has 16 divisors (see below), whose sum is σ = 100367093952. Its totient is φ = 64752952320.

The previous prime is 81604465703. The next prime is 81604465837. The reversal of 81604465747 is 74756440618.

It is not a de Polignac number, because 81604465747 - 2⁷ = 81604465619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81604465694 and 81604465703.

It is not an unprimeable number, because it can be changed into a prime (81604465147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5613658 + ... + 5628175.

It is an arithmetic number, because the mean of its divisors is an integer number (6272943372).

Almost surely, 2^81604465747 is an apocalyptic number.

81604465747 is a deficient number, since it is larger than the sum of its proper divisors (18762628205).

81604465747 is a wasteful number, since it uses less digits than its factorization.

81604465747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11241918.

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 81604465747 in words is "eighty-one billion, six hundred four million, four hundred sixty-five thousand, seven hundred forty-seven".