81132610522 has 4 divisors (see below), whose sum is σ = 121698915786. Its totient is φ = 40566305260.

The previous prime is 81132610513. The next prime is 81132610523. The reversal of 81132610522 is 22501623118.

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

It can be written as a sum of positive squares in only one way, i.e., 60905797681 + 20226812841 = 246791^2 + 142221^2 .

It is a super-2 number, since 2×81132610522² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81132610523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20283152629 + ... + 20283152632.

Almost surely, 2^81132610522 is an apocalyptic number.

81132610522 is a deficient number, since it is larger than the sum of its proper divisors (40566305264).

81132610522 is a wasteful number, since it uses less digits than its factorization.

81132610522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40566305263.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 81132610522 in words is "eighty-one billion, one hundred thirty-two million, six hundred ten thousand, five hundred twenty-two".