81252935485 has 32 divisors (see below), whose sum is σ = 101261242368. Its totient is φ = 62523740160.

The previous prime is 81252935479. The next prime is 81252935501. The reversal of 81252935485 is 58453925218.

It is not a de Polignac number, because 81252935485 - 2¹⁹ = 81252411197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24303724 + ... + 24307066.

It is an arithmetic number, because the mean of its divisors is an integer number (3164413824).

Almost surely, 2^81252935485 is an apocalyptic number.

It is an amenable number.

81252935485 is a deficient number, since it is larger than the sum of its proper divisors (20008306883).

81252935485 is a wasteful number, since it uses less digits than its factorization.

81252935485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285.

The product of its digits is 3456000, while the sum is 52.

The spelling of 81252935485 in words is "eighty-one billion, two hundred fifty-two million, nine hundred thirty-five thousand, four hundred eighty-five".