81573329714 has 8 divisors (see below), whose sum is σ = 123621438108. Its totient is φ = 40366183680.

The previous prime is 81573329713. The next prime is 81573329797. The reversal of 81573329714 is 41792337518.

It can be written as a sum of positive squares in 2 ways, for example, as 80709969025 + 863360689 = 284095^2 + 29383^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81573329711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210240347 + ... + 210240734.

Almost surely, 2^81573329714 is an apocalyptic number.

81573329714 is a deficient number, since it is larger than the sum of its proper divisors (42048108394).

81573329714 is a wasteful number, since it uses less digits than its factorization.

81573329714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420481180.

The product of its digits is 1270080, while the sum is 50.

The spelling of 81573329714 in words is "eighty-one billion, five hundred seventy-three million, three hundred twenty-nine thousand, seven hundred fourteen".