81653305 has 8 divisors (see below), whose sum is σ = 98900352. Its totient is φ = 64711728.

The previous prime is 81653281. The next prime is 81653309. The reversal of 81653305 is 50335618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81653305 - 2⁹ = 81652793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81653309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75777 + ... + 76846.

It is an arithmetic number, because the mean of its divisors is an integer number (12362544).

Almost surely, 2^81653305 is an apocalyptic number.

It is an amenable number.

81653305 is a deficient number, since it is larger than the sum of its proper divisors (17247047).

81653305 is a wasteful number, since it uses less digits than its factorization.

81653305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152735.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 81653305 is about 9036.2218321597. The cubic root of 81653305 is about 433.8350031481.

The spelling of 81653305 in words is "eighty-one million, six hundred fifty-three thousand, three hundred five".