5555777999 has 2 divisors, whose sum is σ = 5555778000. Its totient is φ = 5555777998.

The previous prime is 5555777993. The next prime is 5555778017. The reversal of 5555777999 is 9997775555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5555777999 - 2⁸ = 5555777743 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5555777993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777888999 + 2777889000.

It is an arithmetic number, because the mean of its divisors is an integer number (2777889000).

Almost surely, 2^5555777999 is an apocalyptic number.

5555777999 is a deficient number, since it is larger than the sum of its proper divisors (1).

5555777999 is an equidigital number, since it uses as much as digits as its factorization.

5555777999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156279375, while the sum is 68.

The square root of 5555777999 is about 74537.0914310453. The cubic root of 5555777999 is about 1771.1212531321.

The spelling of 5555777999 in words is "five billion, five hundred fifty-five million, seven hundred seventy-seven thousand, nine hundred ninety-nine".