81101254565 has 16 divisors (see below), whose sum is σ = 102383827200. Its totient is φ = 61581963072.

The previous prime is 81101254547. The next prime is 81101254573. The reversal of 81101254565 is 56545210118.

It is not a de Polignac number, because 81101254565 - 2⁸ = 81101254309 is a prime.

It is a congruent number.

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, 4731437 + ... + 4748546.

It is an arithmetic number, because the mean of its divisors is an integer number (6398989200).

Almost surely, 2^81101254565 is an apocalyptic number.

It is an amenable number.

81101254565 is a deficient number, since it is larger than the sum of its proper divisors (21282572635).

81101254565 is a wasteful number, since it uses less digits than its factorization.

81101254565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480076.

The product of its (nonzero) digits is 48000, while the sum is 38.

The spelling of 81101254565 in words is "eighty-one billion, one hundred one million, two hundred fifty-four thousand, five hundred sixty-five".