81366332352 has 56 divisors (see below), whose sum is σ = 224641842816. Its totient is φ = 25942887168.

The previous prime is 81366332323. The next prime is 81366332353. The reversal of 81366332352 is 25323366318.

It is a super-2 number, since 2×81366332352² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81366332353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9208258 + ... + 9217089.

Almost surely, 2^81366332352 is an apocalyptic number.

It is an amenable number.

81366332352 is an abundant number, since it is smaller than the sum of its proper divisors (143275510464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81366332352 is a wasteful number, since it uses less digits than its factorization.

81366332352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18425385 (or 18425375 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The spelling of 81366332352 in words is "eighty-one billion, three hundred sixty-six million, three hundred thirty-two thousand, three hundred fifty-two".