81480076897 has 4 divisors (see below), whose sum is σ = 85022688960. Its totient is φ = 77937464836.

The previous prime is 81480076877. The next prime is 81480076939. The reversal of 81480076897 is 79867008418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81480076897 - 2²³ = 81471688289 is a prime.

It is a super-2 number, since 2×81480076897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81480076807) by changing a digit.

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, 1771305997 + ... + 1771306042.

It is an arithmetic number, because the mean of its divisors is an integer number (21255672240).

Almost surely, 2^81480076897 is an apocalyptic number.

It is an amenable number.

81480076897 is a deficient number, since it is larger than the sum of its proper divisors (3542612063).

81480076897 is a wasteful number, since it uses less digits than its factorization.

81480076897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542612062.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 81480076897 in words is "eighty-one billion, four hundred eighty million, seventy-six thousand, eight hundred ninety-seven".