81803567452 has 12 divisors (see below), whose sum is σ = 151577198640. Its totient is φ = 38495796416.

The previous prime is 81803567413. The next prime is 81803567453. The reversal of 81803567452 is 25476530818.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81803567396 and 81803567405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81803567453) 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, 601496752 + ... + 601496887.

It is an arithmetic number, because the mean of its divisors is an integer number (12631433220).

Almost surely, 2^81803567452 is an apocalyptic number.

It is an amenable number.

81803567452 is a deficient number, since it is larger than the sum of its proper divisors (69773631188).

81803567452 is a wasteful number, since it uses less digits than its factorization.

81803567452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202993660 (or 1202993658 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 81803567452 in words is "eighty-one billion, eight hundred three million, five hundred sixty-seven thousand, four hundred fifty-two".