81146225935 has 4 divisors (see below), whose sum is σ = 97375471128. Its totient is φ = 64916980744.

The previous prime is 81146225933. The next prime is 81146225971. The reversal of 81146225935 is 53952264118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81146225935 - 2¹ = 81146225933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81146225933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8114622589 + ... + 8114622598.

It is an arithmetic number, because the mean of its divisors is an integer number (24343867782).

Almost surely, 2^81146225935 is an apocalyptic number.

81146225935 is a deficient number, since it is larger than the sum of its proper divisors (16229245193).

81146225935 is a wasteful number, since it uses less digits than its factorization.

81146225935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16229245192.

The product of its digits is 518400, while the sum is 46.

The spelling of 81146225935 in words is "eighty-one billion, one hundred forty-six million, two hundred twenty-five thousand, nine hundred thirty-five".