81569250744235 has 16 divisors (see below), whose sum is σ = 98871568773120. Its totient is φ = 64596911067360.

The previous prime is 81569250744151. The next prime is 81569250744257. The reversal of 81569250744235 is 53244705296518.

It is not a de Polignac number, because 81569250744235 - 2³⁹ = 81019494930347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29230455 + ... + 31899184.

It is an arithmetic number, because the mean of its divisors is an integer number (6179473048320).

It is a 1-persistent number, because it is pandigital, but 2⋅81569250744235 = 163138501488470 is not.

Almost surely, 2^{81569250744235} is an apocalyptic number.

81569250744235 is a deficient number, since it is larger than the sum of its proper divisors (17302318028885).

81569250744235 is a wasteful number, since it uses less digits than its factorization.

81569250744235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61132338.

The product of its (nonzero) digits is 72576000, while the sum is 61.

The spelling of 81569250744235 in words is "eighty-one trillion, five hundred sixty-nine billion, two hundred fifty million, seven hundred forty-four thousand, two hundred thirty-five".