81654445618 has 8 divisors (see below), whose sum is σ = 123292805760. Its totient is φ = 40556843700.

The previous prime is 81654445603. The next prime is 81654445643.

81654445618 is nontrivially palindromic in base 10.

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

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, 135189178 + ... + 135189781.

It is an arithmetic number, because the mean of its divisors is an integer number (15411600720).

Almost surely, 2^81654445618 is an apocalyptic number.

81654445618 is a deficient number, since it is larger than the sum of its proper divisors (41638360142).

81654445618 is a wasteful number, since it uses less digits than its factorization.

81654445618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270379112.

The product of its digits is 3686400, while the sum is 52.

The spelling of 81654445618 in words is "eighty-one billion, six hundred fifty-four million, four hundred forty-five thousand, six hundred eighteen".