81923341527 has 24 divisors (see below), whose sum is σ = 121112770064. Its totient is φ = 53333489664.

The previous prime is 81923341483. The next prime is 81923341529. The reversal of 81923341527 is 72514332918.

It is a happy number.

81923341527 is a `hidden beast` number, since 8 + 1 + 92 + 3 + 34 + 1 + 527 = 666.

It is not a de Polignac number, because 81923341527 - 2¹⁶ = 81923275991 is a prime.

It is a super-2 number, since 2×81923341527² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81923341529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1911093 + ... + 1953489.

Almost surely, 2^81923341527 is an apocalyptic number.

81923341527 is a deficient number, since it is larger than the sum of its proper divisors (39189428537).

81923341527 is a wasteful number, since it uses less digits than its factorization.

81923341527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47439 (or 47436 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 81923341527 in words is "eighty-one billion, nine hundred twenty-three million, three hundred forty-one thousand, five hundred twenty-seven".