81639814414 has 8 divisors (see below), whose sum is σ = 122850967680. Its totient is φ = 40689491856.

The previous prime is 81639814409. The next prime is 81639814433. The reversal of 81639814414 is 41441893618.

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

It is a congruent 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, 65206894 + ... + 65208145.

It is an arithmetic number, because the mean of its divisors is an integer number (15356370960).

Almost surely, 2^81639814414 is an apocalyptic number.

81639814414 is a deficient number, since it is larger than the sum of its proper divisors (41211153266).

81639814414 is a wasteful number, since it uses less digits than its factorization.

81639814414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130415354.

The product of its digits is 663552, while the sum is 49.

The spelling of 81639814414 in words is "eighty-one billion, six hundred thirty-nine million, eight hundred fourteen thousand, four hundred fourteen".