81564113146 has 8 divisors (see below), whose sum is σ = 124069355424. Its totient is φ = 40207661340.

The previous prime is 81564113129. The next prime is 81564113171. The reversal of 81564113146 is 64131146518.

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

It is a junction number, because it is equal to n+sod(n) for n = 81564113099 and 81564113108.

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, 287197440 + ... + 287197723.

It is an arithmetic number, because the mean of its divisors is an integer number (15508669428).

Almost surely, 2^81564113146 is an apocalyptic number.

81564113146 is a deficient number, since it is larger than the sum of its proper divisors (42505242278).

81564113146 is a wasteful number, since it uses less digits than its factorization.

81564113146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574395236.

The product of its digits is 69120, while the sum is 40.

The spelling of 81564113146 in words is "eighty-one billion, five hundred sixty-four million, one hundred thirteen thousand, one hundred forty-six".