81200846577 has 4 divisors (see below), whose sum is σ = 108267795440. Its totient is φ = 54133897716.

The previous prime is 81200846569. The next prime is 81200846581. The reversal of 81200846577 is 77564800218.

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 not a de Polignac number, because 81200846577 - 2³ = 81200846569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81200846567) 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, 13533474427 + ... + 13533474432.

It is an arithmetic number, because the mean of its divisors is an integer number (27066948860).

Almost surely, 2^81200846577 is an apocalyptic number.

It is an amenable number.

81200846577 is a deficient number, since it is larger than the sum of its proper divisors (27066948863).

81200846577 is a wasteful number, since it uses less digits than its factorization.

81200846577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27066948862.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 81200846577 in words is "eighty-one billion, two hundred million, eight hundred forty-six thousand, five hundred seventy-seven".