81465565101 has 16 divisors (see below), whose sum is σ = 109560912000. Its totient is φ = 53842269888.

The previous prime is 81465565067. The next prime is 81465565117. The reversal of 81465565101 is 10156556418.

It is a happy number.

It is not a de Polignac number, because 81465565101 - 2⁹ = 81465564589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81465565901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80946 + ... + 411683.

It is an arithmetic number, because the mean of its divisors is an integer number (6847557000).

Almost surely, 2^81465565101 is an apocalyptic number.

It is an amenable number.

81465565101 is a deficient number, since it is larger than the sum of its proper divisors (28095346899).

81465565101 is a wasteful number, since it uses less digits than its factorization.

81465565101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493108.

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 81465565101 in words is "eighty-one billion, four hundred sixty-five million, five hundred sixty-five thousand, one hundred one".