81829413458 has 8 divisors (see below), whose sum is σ = 132185975628. Its totient is φ = 37767421584.

The previous prime is 81829413439. The next prime is 81829413461. The reversal of 81829413458 is 85431492818.

It can be written as a sum of positive squares in 2 ways, for example, as 79635146809 + 2194266649 = 282197^2 + 46843^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1573642541 + ... + 1573642592.

Almost surely, 2^81829413458 is an apocalyptic number.

81829413458 is a deficient number, since it is larger than the sum of its proper divisors (50356562170).

81829413458 is a wasteful number, since it uses less digits than its factorization.

81829413458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147285148.

The product of its digits is 2211840, while the sum is 53.

The spelling of 81829413458 in words is "eighty-one billion, eight hundred twenty-nine million, four hundred thirteen thousand, four hundred fifty-eight".