81153931198 has 8 divisors (see below), whose sum is σ = 122660140680. Its totient is φ = 40267217640.

The previous prime is 81153931171. The next prime is 81153931207. The reversal of 81153931198 is 89113935118.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154873653 + ... + 154874176.

It is an arithmetic number, because the mean of its divisors is an integer number (15332517585).

Almost surely, 2^81153931198 is an apocalyptic number.

81153931198 is a deficient number, since it is larger than the sum of its proper divisors (41506209482).

81153931198 is a wasteful number, since it uses less digits than its factorization.

81153931198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309747962.

The product of its digits is 233280, while the sum is 49.

The spelling of 81153931198 in words is "eighty-one billion, one hundred fifty-three million, nine hundred thirty-one thousand, one hundred ninety-eight".