81144192298 has 8 divisors (see below), whose sum is σ = 131079079908. Its totient is φ = 37451165664.

The previous prime is 81144192247. The next prime is 81144192299. The reversal of 81144192298 is 89229144118.

It can be written as a sum of positive squares in 2 ways, for example, as 76097084449 + 5047107849 = 275857^2 + 71043^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81144192299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560465211 + ... + 1560465262.

Almost surely, 2^81144192298 is an apocalyptic number.

81144192298 is a deficient number, since it is larger than the sum of its proper divisors (49934887610).

81144192298 is a wasteful number, since it uses less digits than its factorization.

81144192298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120930488.

The product of its digits is 331776, while the sum is 49.

The spelling of 81144192298 in words is "eighty-one billion, one hundred forty-four million, one hundred ninety-two thousand, two hundred ninety-eight".