81101335574 has 32 divisors (see below), whose sum is σ = 146557382400. Its totient is φ = 32881312800.

The previous prime is 81101335547. The next prime is 81101335577. The reversal of 81101335574 is 47553310118.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81101335577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31004 + ... + 403935.

It is an arithmetic number, because the mean of its divisors is an integer number (4579918200).

Almost surely, 2^81101335574 is an apocalyptic number.

81101335574 is a deficient number, since it is larger than the sum of its proper divisors (65456046826).

81101335574 is a wasteful number, since it uses less digits than its factorization.

81101335574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435668.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 81101335574 in words is "eighty-one billion, one hundred one million, three hundred thirty-five thousand, five hundred seventy-four".