81670020254 has 8 divisors (see below), whose sum is σ = 123694399920. Its totient is φ = 40438553616.

The previous prime is 81670020217. The next prime is 81670020319. The reversal of 81670020254 is 45202007618.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198227999 + ... + 198228410.

It is an arithmetic number, because the mean of its divisors is an integer number (15461799990).

Almost surely, 2^81670020254 is an apocalyptic number.

81670020254 is a deficient number, since it is larger than the sum of its proper divisors (42024379666).

81670020254 is a wasteful number, since it uses less digits than its factorization.

81670020254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396456514.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 81670020254 in words is "eighty-one billion, six hundred seventy million, twenty thousand, two hundred fifty-four".