81092855551 has 8 divisors (see below), whose sum is σ = 85363612400. Its totient is φ = 76822369920.

The previous prime is 81092855533. The next prime is 81092855579. The reversal of 81092855551 is 15555829018.

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 81092855551 - 2⁷ = 81092855423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81092855495 and 81092855504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81092855951) 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, 900985 + ... + 986893.

It is an arithmetic number, because the mean of its divisors is an integer number (10670451550).

Almost surely, 2^81092855551 is an apocalyptic number.

81092855551 is a deficient number, since it is larger than the sum of its proper divisors (4270756849).

81092855551 is a wasteful number, since it uses less digits than its factorization.

81092855551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135609.

The product of its (nonzero) digits is 720000, while the sum is 49.

The spelling of 81092855551 in words is "eighty-one billion, ninety-two million, eight hundred fifty-five thousand, five hundred fifty-one".