7198985977 has 2 divisors, whose sum is σ = 7198985978. Its totient is φ = 7198985976.

The previous prime is 7198985953. The next prime is 7198986029. The reversal of 7198985977 is 7795898917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6872244201 + 326741776 = 82899^2 + 18076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7198985977 is a prime.

It is not a weakly prime, because it can be changed into another prime (7198985377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3599492988 + 3599492989.

It is an arithmetic number, because the mean of its divisors is an integer number (3599492989).

Almost surely, 2^7198985977 is an apocalyptic number.

It is an amenable number.

7198985977 is a deficient number, since it is larger than the sum of its proper divisors (1).

7198985977 is an equidigital number, since it uses as much as digits as its factorization.

7198985977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80015040, while the sum is 70.

The square root of 7198985977 is about 84846.8383441599. The cubic root of 7198985977 is about 1930.8881141736. Note that the first 3 decimals are identical.

The spelling of 7198985977 in words is "seven billion, one hundred ninety-eight million, nine hundred eighty-five thousand, nine hundred seventy-seven".