81384116246 has 4 divisors (see below), whose sum is σ = 122076174372. Its totient is φ = 40692058122.

The previous prime is 81384116237. The next prime is 81384116249. The reversal of 81384116246 is 64261148318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64261148318 = 2 ⋅32130574159.

It is a super-2 number, since 2×81384116246² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81384116197 and 81384116206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81384116249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20346029060 + ... + 20346029063.

It is an arithmetic number, because the mean of its divisors is an integer number (30519043593).

Almost surely, 2^81384116246 is an apocalyptic number.

81384116246 is a deficient number, since it is larger than the sum of its proper divisors (40692058126).

81384116246 is a wasteful number, since it uses less digits than its factorization.

81384116246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40692058125.

The product of its digits is 221184, while the sum is 44.

The spelling of 81384116246 in words is "eighty-one billion, three hundred eighty-four million, one hundred sixteen thousand, two hundred forty-six".