81450109929 has 64 divisors (see below), whose sum is σ = 124958592000. Its totient is φ = 46869000192.

The previous prime is 81450109879. The next prime is 81450109943. The reversal of 81450109929 is 92990105418.

It is not a de Polignac number, because 81450109929 - 2⁹ = 81450109417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81450109969) 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, 4699722 + ... + 4717020.

It is an arithmetic number, because the mean of its divisors is an integer number (1952478000).

Almost surely, 2^81450109929 is an apocalyptic number.

It is an amenable number.

81450109929 is a deficient number, since it is larger than the sum of its proper divisors (43508482071).

81450109929 is a wasteful number, since it uses less digits than its factorization.

81450109929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17494.

The product of its (nonzero) digits is 233280, while the sum is 48.

The spelling of 81450109929 in words is "eighty-one billion, four hundred fifty million, one hundred nine thousand, nine hundred twenty-nine".