81200226777 has 4 divisors (see below), whose sum is σ = 108266969040. Its totient is φ = 54133484516.

The previous prime is 81200226713. The next prime is 81200226787. The reversal of 81200226777 is 77762200218.

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 81200226777 - 2⁶ = 81200226713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81200226787) 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, 13533371127 + ... + 13533371132.

It is an arithmetic number, because the mean of its divisors is an integer number (27066742260).

Almost surely, 2^81200226777 is an apocalyptic number.

It is an amenable number.

81200226777 is a deficient number, since it is larger than the sum of its proper divisors (27066742263).

81200226777 is a wasteful number, since it uses less digits than its factorization.

81200226777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27066742262.

The product of its (nonzero) digits is 131712, while the sum is 42.

The spelling of 81200226777 in words is "eighty-one billion, two hundred million, two hundred twenty-six thousand, seven hundred seventy-seven".