655099979 has 2 divisors, whose sum is σ = 655099980. Its totient is φ = 655099978.

The previous prime is 655099957. The next prime is 655100021. The reversal of 655099979 is 979990556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655099979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (655099079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327549989 + 327549990.

It is an arithmetic number, because the mean of its divisors is an integer number (327549990).

Almost surely, 2^655099979 is an apocalyptic number.

655099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

655099979 is an equidigital number, since it uses as much as digits as its factorization.

655099979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6889050, while the sum is 59.

The square root of 655099979 is about 25594.9209610032. The cubic root of 655099979 is about 868.4987449033.

The spelling of 655099979 in words is "six hundred fifty-five million, ninety-nine thousand, nine hundred seventy-nine".