81534068732 has 6 divisors (see below), whose sum is σ = 142684620288. Its totient is φ = 40767034364.

The previous prime is 81534068689. The next prime is 81534068767. The reversal of 81534068732 is 23786043518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10191758588 + ... + 10191758595.

It is an arithmetic number, because the mean of its divisors is an integer number (23780770048).

Almost surely, 2^81534068732 is an apocalyptic number.

It is an amenable number.

81534068732 is a deficient number, since it is larger than the sum of its proper divisors (61150551556).

81534068732 is a wasteful number, since it uses less digits than its factorization.

81534068732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20383517187 (or 20383517185 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 81534068732 in words is "eighty-one billion, five hundred thirty-four million, sixty-eight thousand, seven hundred thirty-two".