655220077 has 2 divisors, whose sum is σ = 655220078. Its totient is φ = 655220076.

The previous prime is 655220063. The next prime is 655220081. The reversal of 655220077 is 770022556.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648517156 + 6702921 = 25466^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 655220077 - 2²³ = 646831469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655220017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327610038 + 327610039.

It is an arithmetic number, because the mean of its divisors is an integer number (327610039).

Almost surely, 2^655220077 is an apocalyptic number.

It is an amenable number.

655220077 is a deficient number, since it is larger than the sum of its proper divisors (1).

655220077 is an equidigital number, since it uses as much as digits as its factorization.

655220077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 655220077 is about 25597.2669830199. The cubic root of 655220077 is about 868.5518149650.

The spelling of 655220077 in words is "six hundred fifty-five million, two hundred twenty thousand, seventy-seven".