81448545464772 has 96 divisors (see below), whose sum is σ = 207619422151680. Its totient is φ = 24771523244160.

The previous prime is 81448545464701. The next prime is 81448545464779. The reversal of 81448545464772 is 27746454584418.

It is a happy number.

81448545464772 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a junction number, because it is equal to n+sod(n) for n = 81448545464697 and 81448545464706.

It is not an unprimeable number, because it can be changed into a prime (81448545464779) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60636754 + ... + 61965417.

It is an arithmetic number, because the mean of its divisors is an integer number (2162702314080).

Almost surely, 2^{81448545464772} is an apocalyptic number.

It is an amenable number.

81448545464772 is an abundant number, since it is smaller than the sum of its proper divisors (126170876686908).

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

81448545464772 is a wasteful number, since it uses less digits than its factorization.

81448545464772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122602313 (or 122602311 counting only the distinct ones).

The product of its digits is 963379200, while the sum is 69.

The spelling of 81448545464772 in words is "eighty-one trillion, four hundred forty-eight billion, five hundred forty-five million, four hundred sixty-four thousand, seven hundred seventy-two".