81063653 has 16 divisors (see below), whose sum is σ = 90355776. Its totient is φ = 72109440.

The previous prime is 81063641. The next prime is 81063677. The reversal of 81063653 is 35636018.

It is a cyclic number.

It is not a de Polignac number, because 81063653 - 2⁸ = 81063397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81063053) 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, 125750 + ... + 126392.

It is an arithmetic number, because the mean of its divisors is an integer number (5647236).

Almost surely, 2^81063653 is an apocalyptic number.

It is an amenable number.

81063653 is a deficient number, since it is larger than the sum of its proper divisors (9292123).

81063653 is a wasteful number, since it uses less digits than its factorization.

81063653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 81063653 is about 9003.5355833139. The cubic root of 81063653 is about 432.7881790858.

The spelling of 81063653 in words is "eighty-one million, sixty-three thousand, six hundred fifty-three".