81551088085 has 16 divisors (see below), whose sum is σ = 98818574400. Its totient is φ = 64603759360.

The previous prime is 81551088083. The next prime is 81551088107. The reversal of 81551088085 is 58088015518.

It is not a de Polignac number, because 81551088085 - 2¹ = 81551088083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81551088083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550266 + ... + 682564.

It is an arithmetic number, because the mean of its divisors is an integer number (6176160900).

Almost surely, 2^81551088085 is an apocalyptic number.

It is an amenable number.

81551088085 is a deficient number, since it is larger than the sum of its proper divisors (17267486315).

81551088085 is a wasteful number, since it uses less digits than its factorization.

81551088085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133508.

The product of its (nonzero) digits is 512000, while the sum is 49.

The spelling of 81551088085 in words is "eighty-one billion, five hundred fifty-one million, eighty-eight thousand, eighty-five".