81885955726 has 4 divisors (see below), whose sum is σ = 122828933592. Its totient is φ = 40942977862.

The previous prime is 81885955721. The next prime is 81885955727. The reversal of 81885955726 is 62755958818.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81885955721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20471488930 + ... + 20471488933.

It is an arithmetic number, because the mean of its divisors is an integer number (30707233398).

Almost surely, 2^81885955726 is an apocalyptic number.

81885955726 is a deficient number, since it is larger than the sum of its proper divisors (40942977866).

81885955726 is a wasteful number, since it uses less digits than its factorization.

81885955726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40942977865.

The product of its digits is 48384000, while the sum is 64.

The spelling of 81885955726 in words is "eighty-one billion, eight hundred eighty-five million, nine hundred fifty-five thousand, seven hundred twenty-six".