81896153385 has 8 divisors (see below), whose sum is σ = 131033845440. Its totient is φ = 43677948464.

The previous prime is 81896153371. The next prime is 81896153389. The reversal of 81896153385 is 58335169818.

It is a happy number.

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 81896153385 - 2²⁷ = 81761935657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81896153389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2729871765 + ... + 2729871794.

It is an arithmetic number, because the mean of its divisors is an integer number (16379230680).

Almost surely, 2^81896153385 is an apocalyptic number.

It is an amenable number.

81896153385 is a deficient number, since it is larger than the sum of its proper divisors (49137692055).

81896153385 is a wasteful number, since it uses less digits than its factorization.

81896153385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459743567.

The product of its digits is 6220800, while the sum is 57.

The spelling of 81896153385 in words is "eighty-one billion, eight hundred ninety-six million, one hundred fifty-three thousand, three hundred eighty-five".