81529895575 has 6 divisors (see below), whose sum is σ = 101097070544. Its totient is φ = 65223916440.

The previous prime is 81529895471. The next prime is 81529895611. The reversal of 81529895575 is 57559892518.

It is not a de Polignac number, because 81529895575 - 2¹¹ = 81529893527 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 5 ways as a sum of consecutive naturals, for example, 1630597887 + ... + 1630597936.

Almost surely, 2^81529895575 is an apocalyptic number.

81529895575 is a deficient number, since it is larger than the sum of its proper divisors (19567174969).

81529895575 is a wasteful number, since it uses less digits than its factorization.

81529895575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261195833 (or 3261195828 counting only the distinct ones).

The product of its digits is 45360000, while the sum is 64.

The spelling of 81529895575 in words is "eighty-one billion, five hundred twenty-nine million, eight hundred ninety-five thousand, five hundred seventy-five".