81158545435 has 8 divisors (see below), whose sum is σ = 106243914096. Its totient is φ = 59024396640.

The previous prime is 81158545427. The next prime is 81158545459. The reversal of 81158545435 is 53454585118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81158545435 - 2³ = 81158545427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 737804904 + ... + 737805013.

It is an arithmetic number, because the mean of its divisors is an integer number (13280489262).

Almost surely, 2^81158545435 is an apocalyptic number.

81158545435 is a deficient number, since it is larger than the sum of its proper divisors (25085368661).

81158545435 is a wasteful number, since it uses less digits than its factorization.

81158545435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475609933.

The product of its digits is 1920000, while the sum is 49.

The spelling of 81158545435 in words is "eighty-one billion, one hundred fifty-eight million, five hundred forty-five thousand, four hundred thirty-five".