655761779 has 2 divisors, whose sum is σ = 655761780. Its totient is φ = 655761778.

The previous prime is 655761727. The next prime is 655761781. The reversal of 655761779 is 977167556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655761779 - 2¹⁶ = 655696243 is a prime.

Together with 655761781, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655761779.

It is not a weakly prime, because it can be changed into another prime (655761709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327880889 + 327880890.

It is an arithmetic number, because the mean of its divisors is an integer number (327880890).

Almost surely, 2^655761779 is an apocalyptic number.

655761779 is a deficient number, since it is larger than the sum of its proper divisors (1).

655761779 is an equidigital number, since it uses as much as digits as its factorization.

655761779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2778300, while the sum is 53.

The square root of 655761779 is about 25607.8460437421. The cubic root of 655761779 is about 868.7911069071.

The spelling of 655761779 in words is "six hundred fifty-five million, seven hundred sixty-one thousand, seven hundred seventy-nine".