81269523982 has 4 divisors (see below), whose sum is σ = 121904285976. Its totient is φ = 40634761990.

The previous prime is 81269523941. The next prime is 81269523989. The reversal of 81269523982 is 28932596218.

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 (81269523989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20317380994 + ... + 20317380997.

It is an arithmetic number, because the mean of its divisors is an integer number (30476071494).

Almost surely, 2^81269523982 is an apocalyptic number.

81269523982 is a deficient number, since it is larger than the sum of its proper divisors (40634761994).

81269523982 is a wasteful number, since it uses less digits than its factorization.

81269523982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40634761993.

The product of its digits is 3732480, while the sum is 55.

The spelling of 81269523982 in words is "eighty-one billion, two hundred sixty-nine million, five hundred twenty-three thousand, nine hundred eighty-two".