81204719513 has 16 divisors (see below), whose sum is σ = 84676026240. Its totient is φ = 77801492736.

The previous prime is 81204719473. The next prime is 81204719537. The reversal of 81204719513 is 31591740218.

It is a cyclic number.

It is not a de Polignac number, because 81204719513 - 2¹⁰ = 81204718489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81204739513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9636620 + ... + 9645042.

It is an arithmetic number, because the mean of its divisors is an integer number (5292251640).

Almost surely, 2^81204719513 is an apocalyptic number.

It is an amenable number.

81204719513 is a deficient number, since it is larger than the sum of its proper divisors (3471306727).

81204719513 is a wasteful number, since it uses less digits than its factorization.

81204719513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 81204719513 in words is "eighty-one billion, two hundred four million, seven hundred nineteen thousand, five hundred thirteen".