81553892019 has 16 divisors (see below), whose sum is σ = 110406926112. Its totient is φ = 53537476608.

The previous prime is 81553891963. The next prime is 81553892083. The reversal of 81553892019 is 91029835518.

It is not a de Polignac number, because 81553892019 - 2¹⁷ = 81553760947 is a prime.

It is a super-2 number, since 2×81553892019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81553882019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166654 + ... + 436899.

It is an arithmetic number, because the mean of its divisors is an integer number (6900432882).

Almost surely, 2^81553892019 is an apocalyptic number.

81553892019 is a deficient number, since it is larger than the sum of its proper divisors (28853034093).

81553892019 is a wasteful number, since it uses less digits than its factorization.

81553892019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604246.

The product of its (nonzero) digits is 777600, while the sum is 51.

The spelling of 81553892019 in words is "eighty-one billion, five hundred fifty-three million, eight hundred ninety-two thousand, nineteen".