81446104575 has 144 divisors (see below), whose sum is σ = 161761646592. Its totient is φ = 38844000000.

The previous prime is 81446104561. The next prime is 81446104589. The reversal of 81446104575 is 57540164418.

81446104575 is a `hidden beast` number, since 8 + 14 + 4 + 61 + 0 + 4 + 575 = 666.

It is an interprime number because it is at equal distance from previous prime (81446104561) and next prime (81446104589).

It is not a de Polignac number, because 81446104575 - 2⁷ = 81446104447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81446104575.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 41744850 + ... + 41746800.

It is an arithmetic number, because the mean of its divisors is an integer number (1123344768).

Almost surely, 2^81446104575 is an apocalyptic number.

81446104575 is a deficient number, since it is larger than the sum of its proper divisors (80315542017).

81446104575 is a wasteful number, since it uses less digits than its factorization.

81446104575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246 (or 2238 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 81446104575 in words is "eighty-one billion, four hundred forty-six million, one hundred four thousand, five hundred seventy-five".