81026333215 has 24 divisors (see below), whose sum is σ = 103338145152. Its totient is φ = 60978178560.

The previous prime is 81026333197. The next prime is 81026333281. The reversal of 81026333215 is 51233362018.

It is not a de Polignac number, because 81026333215 - 2¹⁵ = 81026300447 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 23 ways as a sum of consecutive naturals, for example, 3196722 + ... + 3221968.

It is an arithmetic number, because the mean of its divisors is an integer number (4305756048).

Almost surely, 2^81026333215 is an apocalyptic number.

81026333215 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81026333215 is a deficient number, since it is larger than the sum of its proper divisors (22311811937).

81026333215 is a wasteful number, since it uses less digits than its factorization.

81026333215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27507 (or 27490 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 81026333215 in words is "eighty-one billion, twenty-six million, three hundred thirty-three thousand, two hundred fifteen".