81474757998106 has 128 divisors (see below), whose sum is σ = 144984587489280. Its totient is φ = 33916911360000.

The previous prime is 81474757998103. The next prime is 81474757998131. The reversal of 81474757998106 is 60189975747418.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81474757998103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10288512015 + ... + 10288519933.

It is an arithmetic number, because the mean of its divisors is an integer number (1132692089760).

Almost surely, 2^{81474757998106} is an apocalyptic number.

81474757998106 is a deficient number, since it is larger than the sum of its proper divisors (63509829491174).

81474757998106 is a wasteful number, since it uses less digits than its factorization.

81474757998106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9652.

The product of its (nonzero) digits is 853493760, while the sum is 76.

The spelling of 81474757998106 in words is "eighty-one trillion, four hundred seventy-four billion, seven hundred fifty-seven million, nine hundred ninety-eight thousand, one hundred six".