81709446300 has 36 divisors (see below), whose sum is σ = 236412665496. Its totient is φ = 21789185600.

The previous prime is 81709446293. The next prime is 81709446347. The reversal of 81709446300 is 364490718.

It is a super-2 number, since 2×81709446300² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136182111 + ... + 136182710.

It is an arithmetic number, because the mean of its divisors is an integer number (6567018486).

Almost surely, 2^81709446300 is an apocalyptic number.

It is an amenable number.

81709446300 is an abundant number, since it is smaller than the sum of its proper divisors (154703219196).

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

81709446300 is a wasteful number, since it uses less digits than its factorization.

81709446300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272364838 (or 272364831 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 81709446300 in words is "eighty-one billion, seven hundred nine million, four hundred forty-six thousand, three hundred".