81450754575 has 24 divisors (see below), whose sum is σ = 135972690048. Its totient is φ = 43018646880.

The previous prime is 81450754471. The next prime is 81450754577. The reversal of 81450754575 is 57545705418.

It is not a de Polignac number, because 81450754575 - 2¹⁶ = 81450689039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81450754577) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5264169 + ... + 5279618.

It is an arithmetic number, because the mean of its divisors is an integer number (5665528752).

Almost surely, 2^81450754575 is an apocalyptic number.

81450754575 is a deficient number, since it is larger than the sum of its proper divisors (54521935473).

81450754575 is a wasteful number, since it uses less digits than its factorization.

81450754575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10543903 (or 10543898 counting only the distinct ones).

The product of its (nonzero) digits is 3920000, while the sum is 51.

The spelling of 81450754575 in words is "eighty-one billion, four hundred fifty million, seven hundred fifty-four thousand, five hundred seventy-five".