81676334893 has 8 divisors (see below), whose sum is σ = 82028643840. Its totient is φ = 81324114480.

The previous prime is 81676334863. The next prime is 81676334923. The reversal of 81676334893 is 39843367618.

It is an interprime number because it is at equal distance from previous prime (81676334863) and next prime (81676334923).

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

It is a cyclic number.

It is not a de Polignac number, because 81676334893 - 2¹³ = 81676326701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81676334863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387596 + ... + 2421562.

It is an arithmetic number, because the mean of its divisors is an integer number (10253580480).

Almost surely, 2^81676334893 is an apocalyptic number.

It is an amenable number.

81676334893 is a deficient number, since it is larger than the sum of its proper divisors (352308947).

81676334893 is a wasteful number, since it uses less digits than its factorization.

81676334893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44267.

The product of its digits is 15676416, while the sum is 58.

The spelling of 81676334893 in words is "eighty-one billion, six hundred seventy-six million, three hundred thirty-four thousand, eight hundred ninety-three".