81555233027 has 8 divisors (see below), whose sum is σ = 82658729664. Its totient is φ = 80454615208.

The previous prime is 81555233017. The next prime is 81555233041. The reversal of 81555233027 is 72033255518.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81555233027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81555233017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662633 + ... + 776010.

It is an arithmetic number, because the mean of its divisors is an integer number (10332341208).

Almost surely, 2^81555233027 is an apocalyptic number.

81555233027 is a deficient number, since it is larger than the sum of its proper divisors (1103496637).

81555233027 is a wasteful number, since it uses less digits than its factorization.

81555233027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439409.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 81555233027 in words is "eighty-one billion, five hundred fifty-five million, two hundred thirty-three thousand, twenty-seven".