6989137919977 has 2 divisors, whose sum is σ = 6989137919978. Its totient is φ = 6989137919976.

The previous prime is 6989137919927. The next prime is 6989137920049. The reversal of 6989137919977 is 7799197319896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4071016440976 + 2918121479001 = 2017676^2 + 1708251^2 .

It is a cyclic number.

It is not a de Polignac number, because 6989137919977 - 2¹⁵ = 6989137887209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6989137919894 and 6989137919903.

It is not a weakly prime, because it can be changed into another prime (6989137919927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494568959988 + 3494568959989.

It is an arithmetic number, because the mean of its divisors is an integer number (3494568959989).

Almost surely, 2^{6989137919977} is an apocalyptic number.

It is an amenable number.

6989137919977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989137919977 is an equidigital number, since it uses as much as digits as its factorization.

6989137919977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916548208, while the sum is 85.

The spelling of 6989137919977 in words is "six trillion, nine hundred eighty-nine billion, one hundred thirty-seven million, nine hundred nineteen thousand, nine hundred seventy-seven".