81654003591 has 16 divisors (see below), whose sum is σ = 110170368000. Its totient is φ = 53789544288.

The previous prime is 81654003491. The next prime is 81654003601. The reversal of 81654003591 is 19530045618.

It is not a de Polignac number, because 81654003591 - 2⁷ = 81654003463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81654003491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220191 + ... + 460208.

It is an arithmetic number, because the mean of its divisors is an integer number (6885648000).

Almost surely, 2^81654003591 is an apocalyptic number.

81654003591 is a deficient number, since it is larger than the sum of its proper divisors (28516364409).

81654003591 is a wasteful number, since it uses less digits than its factorization.

81654003591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680878.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 81654003591 in words is "eighty-one billion, six hundred fifty-four million, three thousand, five hundred ninety-one".