219999999977 has 2 divisors, whose sum is σ = 219999999978. Its totient is φ = 219999999976.

The previous prime is 219999999929. The next prime is 220000000001. The reversal of 219999999977 is 779999999912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121566584896 + 98433415081 = 348664^2 + 313741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219999999977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 219999999892 and 219999999901.

It is not a weakly prime, because it can be changed into another prime (219999999277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109999999988 + 109999999989.

It is an arithmetic number, because the mean of its divisors is an integer number (109999999989).

Almost surely, 2^219999999977 is an apocalyptic number.

It is an amenable number.

219999999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

219999999977 is an equidigital number, since it uses as much as digits as its factorization.

219999999977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4218578658, while the sum is 89.

The spelling of 219999999977 in words is "two hundred nineteen billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".