81085173352 has 32 divisors (see below), whose sum is σ = 152954195400. Its totient is φ = 40297513984.

The previous prime is 81085173347. The next prime is 81085173361. The reversal of 81085173352 is 25337158018.

It can be written as a sum of positive squares in 4 ways, for example, as 74827414116 + 6257759236 = 273546^2 + 79106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81085173299 and 81085173308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8754708 + ... + 8763964.

Almost surely, 2^81085173352 is an apocalyptic number.

It is an amenable number.

81085173352 is a deficient number, since it is larger than the sum of its proper divisors (71869022048).

81085173352 is a wasteful number, since it uses less digits than its factorization.

81085173352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15765 (or 15761 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 81085173352 in words is "eighty-one billion, eighty-five million, one hundred seventy-three thousand, three hundred fifty-two".