81026697688772 has 24 divisors (see below), whose sum is σ = 156218889701952. Its totient is φ = 36465660524000.

The previous prime is 81026697688751. The next prime is 81026697688787. The reversal of 81026697688772 is 27788679662018.

It is a junction number, because it is equal to n+sod(n) for n = 81026697688693 and 81026697688702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9116410688 + ... + 9116419575.

It is an arithmetic number, because the mean of its divisors is an integer number (6509120404248).

Almost surely, 2^{81026697688772} is an apocalyptic number.

It is an amenable number.

81026697688772 is a deficient number, since it is larger than the sum of its proper divisors (75192192013180).

81026697688772 is a wasteful number, since it uses less digits than its factorization.

81026697688772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18232830379 (or 18232830377 counting only the distinct ones).

The product of its (nonzero) digits is 1365590016, while the sum is 77.

The spelling of 81026697688772 in words is "eighty-one trillion, twenty-six billion, six hundred ninety-seven million, six hundred eighty-eight thousand, seven hundred seventy-two".