998667686077 has 2 divisors, whose sum is σ = 998667686078. Its totient is φ = 998667686076.

The previous prime is 998667685993. The next prime is 998667686129. The reversal of 998667686077 is 770686766899.

998667686077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830906994681 + 167760691396 = 911541^2 + 409586^2 .

It is a cyclic number.

It is not a de Polignac number, because 998667686077 - 2¹¹ = 998667684029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998667685988 and 998667686006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998667686977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499333843038 + 499333843039.

It is an arithmetic number, because the mean of its divisors is an integer number (499333843039).

Almost surely, 2^998667686077 is an apocalyptic number.

It is an amenable number.

998667686077 is a deficient number, since it is larger than the sum of its proper divisors (1).

998667686077 is an equidigital number, since it uses as much as digits as its factorization.

998667686077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304433152, while the sum is 79.

The spelling of 998667686077 in words is "nine hundred ninety-eight billion, six hundred sixty-seven million, six hundred eighty-six thousand, seventy-seven".