81156304521364 has 12 divisors (see below), whose sum is σ = 142223848196500. Its totient is φ = 40520919322368.

The previous prime is 81156304521361. The next prime is 81156304521401. The reversal of 81156304521364 is 46312540365118.

It can be written as a sum of positive squares in 2 ways, for example, as 19171262250000 + 61985042271364 = 4378500^2 + 7873058^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81156304521361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14308231389 + ... + 14308237060.

Almost surely, 2^{81156304521364} is an apocalyptic number.

It is an amenable number.

81156304521364 is a deficient number, since it is larger than the sum of its proper divisors (61067543675136).

81156304521364 is a wasteful number, since it uses less digits than its factorization.

81156304521364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28616469162 (or 28616469160 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 81156304521364 in words is "eighty-one trillion, one hundred fifty-six billion, three hundred four million, five hundred twenty-one thousand, three hundred sixty-four".