81230116749 has 8 divisors (see below), whose sum is σ = 109523753280. Its totient is φ = 53544945696.

The previous prime is 81230116741. The next prime is 81230116753. The reversal of 81230116749 is 94761103218.

It is a happy number.

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

It is not a de Polignac number, because 81230116749 - 2³ = 81230116741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81230116749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81230116741) 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, 152116057 + ... + 152116590.

It is an arithmetic number, because the mean of its divisors is an integer number (13690469160).

Almost surely, 2^81230116749 is an apocalyptic number.

81230116749 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

81230116749 is a deficient number, since it is larger than the sum of its proper divisors (28293636531).

81230116749 is a wasteful number, since it uses less digits than its factorization.

81230116749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304232739.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 81230116749 in words is "eighty-one billion, two hundred thirty million, one hundred sixteen thousand, seven hundred forty-nine".