81547805746 has 16 divisors (see below), whose sum is σ = 134415897120. Its totient is φ = 36796619680.

The previous prime is 81547805719. The next prime is 81547805753. The reversal of 81547805746 is 64750874518.

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, 13525156 + ... + 13531183.

It is an arithmetic number, because the mean of its divisors is an integer number (8400993570).

Almost surely, 2^81547805746 is an apocalyptic number.

81547805746 is a deficient number, since it is larger than the sum of its proper divisors (52868091374).

81547805746 is a wasteful number, since it uses less digits than its factorization.

81547805746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27056489.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 81547805746 in words is "eighty-one billion, five hundred forty-seven million, eight hundred five thousand, seven hundred forty-six".