81998543347 has 8 divisors (see below), whose sum is σ = 93732211296. Its totient is φ = 70269772992.

The previous prime is 81998543327. The next prime is 81998543353. The reversal of 81998543347 is 74334589918.

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 81998543347 - 2¹⁵ = 81998510579 is a prime.

It is a super-2 number, since 2×81998543347² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81998543317) 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, 1188448 + ... + 1255549.

It is an arithmetic number, because the mean of its divisors is an integer number (11716526412).

Almost surely, 2^81998543347 is an apocalyptic number.

81998543347 is a deficient number, since it is larger than the sum of its proper divisors (11733667949).

81998543347 is a wasteful number, since it uses less digits than its factorization.

81998543347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448797.

The product of its digits is 26127360, while the sum is 61.

The spelling of 81998543347 in words is "eighty-one billion, nine hundred ninety-eight million, five hundred forty-three thousand, three hundred forty-seven".