81653036365 has 32 divisors (see below), whose sum is σ = 101982569472. Its totient is φ = 62693568000.

The previous prime is 81653036321. The next prime is 81653036419. The reversal of 81653036365 is 56363035618.

It is not a de Polignac number, because 81653036365 - 2⁹ = 81653035853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9578305 + ... + 9586825.

It is an arithmetic number, because the mean of its divisors is an integer number (3186955296).

Almost surely, 2^81653036365 is an apocalyptic number.

It is an amenable number.

81653036365 is a deficient number, since it is larger than the sum of its proper divisors (20329533107).

81653036365 is a wasteful number, since it uses less digits than its factorization.

81653036365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9061.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 81653036365 in words is "eighty-one billion, six hundred fifty-three million, thirty-six thousand, three hundred sixty-five".