81150975446 has 8 divisors (see below), whose sum is σ = 122189302224. Its totient is φ = 40421208040.

The previous prime is 81150975439. The next prime is 81150975523. The reversal of 81150975446 is 64457905118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81150975394 and 81150975403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77139185 + ... + 77140236.

It is an arithmetic number, because the mean of its divisors is an integer number (15273662778).

Almost surely, 2^81150975446 is an apocalyptic number.

81150975446 is a deficient number, since it is larger than the sum of its proper divisors (41038326778).

81150975446 is a wasteful number, since it uses less digits than its factorization.

81150975446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154279686.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 81150975446 in words is "eighty-one billion, one hundred fifty million, nine hundred seventy-five thousand, four hundred forty-six".