81004582546 has 4 divisors (see below), whose sum is σ = 121506873822. Its totient is φ = 40502291272.

The previous prime is 81004582537. The next prime is 81004582573. The reversal of 81004582546 is 64528540018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62938265625 + 18066316921 = 250875^2 + 134411^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20251145635 + ... + 20251145638.

Almost surely, 2^81004582546 is an apocalyptic number.

81004582546 is a deficient number, since it is larger than the sum of its proper divisors (40502291276).

81004582546 is a wasteful number, since it uses less digits than its factorization.

81004582546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40502291275.

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 81004582546 in words is "eighty-one billion, four million, five hundred eighty-two thousand, five hundred forty-six".