81358798235 has 32 divisors (see below), whose sum is σ = 115812523008. Its totient is φ = 54088168320.

The previous prime is 81358798231. The next prime is 81358798259. The reversal of 81358798235 is 53289785318.

It is not a de Polignac number, because 81358798235 - 2² = 81358798231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81358798231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478727 + ... + 626016.

It is an arithmetic number, because the mean of its divisors is an integer number (3619141344).

Almost surely, 2^81358798235 is an apocalyptic number.

81358798235 is a deficient number, since it is larger than the sum of its proper divisors (34453724773).

81358798235 is a wasteful number, since it uses less digits than its factorization.

81358798235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104875.

The product of its digits is 14515200, while the sum is 59.

The spelling of 81358798235 in words is "eighty-one billion, three hundred fifty-eight million, seven hundred ninety-eight thousand, two hundred thirty-five".