81926900529 has 4 divisors (see below), whose sum is σ = 109235867376. Its totient is φ = 54617933684.

The previous prime is 81926900513. The next prime is 81926900543. The reversal of 81926900529 is 92500962918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81926900529 - 2⁴ = 81926900513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81926900509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13654483419 + ... + 13654483424.

It is an arithmetic number, because the mean of its divisors is an integer number (27308966844).

Almost surely, 2^81926900529 is an apocalyptic number.

It is an amenable number.

81926900529 is a deficient number, since it is larger than the sum of its proper divisors (27308966847).

81926900529 is a wasteful number, since it uses less digits than its factorization.

81926900529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27308966846.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 81926900529 in words is "eighty-one billion, nine hundred twenty-six million, nine hundred thousand, five hundred twenty-nine".