81425781102 has 16 divisors (see below), whose sum is σ = 162902795472. Its totient is φ = 27133388160.

The previous prime is 81425781091. The next prime is 81425781139. The reversal of 81425781102 is 20118752418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2114043 + ... + 2152214.

It is an arithmetic number, because the mean of its divisors is an integer number (10181424717).

Almost surely, 2^81425781102 is an apocalyptic number.

81425781102 is an abundant number, since it is smaller than the sum of its proper divisors (81477014370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81425781102 is a wasteful number, since it uses less digits than its factorization.

81425781102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4269443.

The product of its (nonzero) digits is 35840, while the sum is 39.

The spelling of 81425781102 in words is "eighty-one billion, four hundred twenty-five million, seven hundred eighty-one thousand, one hundred two".