81674841615 has 16 divisors (see below), whose sum is σ = 130704655968. Its totient is φ = 43551612416.

The previous prime is 81674841571. The next prime is 81674841623. The reversal of 81674841615 is 51614847618.

It is a cyclic number.

It is not a de Polignac number, because 81674841615 - 2¹⁴ = 81674825231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437214 + ... + 595403.

It is an arithmetic number, because the mean of its divisors is an integer number (8169040998).

Almost surely, 2^81674841615 is an apocalyptic number.

81674841615 is a deficient number, since it is larger than the sum of its proper divisors (49029814353).

81674841615 is a wasteful number, since it uses less digits than its factorization.

81674841615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037898.

The product of its digits is 1290240, while the sum is 51.

The spelling of 81674841615 in words is "eighty-one billion, six hundred seventy-four million, eight hundred forty-one thousand, six hundred fifteen".