81703916474 has 4 divisors (see below), whose sum is σ = 122555874714. Its totient is φ = 40851958236.

The previous prime is 81703916473. The next prime is 81703916533. The reversal of 81703916474 is 47461930718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57588000625 + 24115915849 = 239975^2 + 155293^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81703916473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20425979117 + ... + 20425979120.

Almost surely, 2^81703916474 is an apocalyptic number.

81703916474 is a deficient number, since it is larger than the sum of its proper divisors (40851958240).

81703916474 is a wasteful number, since it uses less digits than its factorization.

81703916474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40851958239.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 81703916474 in words is "eighty-one billion, seven hundred three million, nine hundred sixteen thousand, four hundred seventy-four".