655394227889 has 4 divisors (see below), whose sum is σ = 655897217856. Its totient is φ = 654891237924.

The previous prime is 655394227883. The next prime is 655394227913. The reversal of 655394227889 is 988722493556.

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 655394227889 - 2¹² = 655394223793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655394227883) 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, 251493029 + ... + 251495634.

It is an arithmetic number, because the mean of its divisors is an integer number (163974304464).

Almost surely, 2^655394227889 is an apocalyptic number.

It is an amenable number.

655394227889 is a deficient number, since it is larger than the sum of its proper divisors (502989967).

655394227889 is a wasteful number, since it uses less digits than its factorization.

655394227889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502989966.

The product of its digits is 261273600, while the sum is 68.

The spelling of 655394227889 in words is "six hundred fifty-five billion, three hundred ninety-four million, two hundred twenty-seven thousand, eight hundred eighty-nine".