655166777 has 4 divisors (see below), whose sum is σ = 655299216. Its totient is φ = 655034340.

The previous prime is 655166737. The next prime is 655166801. The reversal of 655166777 is 777661556.

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 655166777 - 2⁶ = 655166713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655166717) 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, 58499 + ... + 68792.

It is an arithmetic number, because the mean of its divisors is an integer number (163824804).

Almost surely, 2^655166777 is an apocalyptic number.

It is an amenable number.

655166777 is a deficient number, since it is larger than the sum of its proper divisors (132439).

655166777 is a wasteful number, since it uses less digits than its factorization.

655166777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132438.

The product of its digits is 1852200, while the sum is 50.

The square root of 655166777 is about 25596.2258350719. The cubic root of 655166777 is about 868.5282630478.

The spelling of 655166777 in words is "six hundred fifty-five million, one hundred sixty-six thousand, seven hundred seventy-seven".