81528304132867 has 4 divisors (see below), whose sum is σ = 86324086728936. Its totient is φ = 76732521536800.

The previous prime is 81528304132861. The next prime is 81528304133039. The reversal of 81528304132867 is 76823140382518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81528304132867 - 2³ = 81528304132859 is a prime.

It is a super-3 number, since 3×81528304132867³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81528304132861) 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, 2397891298009 + ... + 2397891298042.

It is an arithmetic number, because the mean of its divisors is an integer number (21581021682234).

Almost surely, 2^{81528304132867} is an apocalyptic number.

81528304132867 is a deficient number, since it is larger than the sum of its proper divisors (4795782596069).

81528304132867 is a wasteful number, since it uses less digits than its factorization.

81528304132867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795782596068.

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 81528304132867 in words is "eighty-one trillion, five hundred twenty-eight billion, three hundred four million, one hundred thirty-two thousand, eight hundred sixty-seven".