690268987687 has 2 divisors, whose sum is σ = 690268987688. Its totient is φ = 690268987686.

The previous prime is 690268987679. The next prime is 690268987693. The reversal of 690268987687 is 786789862096.

690268987687 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 is a cyclic number.

It is not a de Polignac number, because 690268987687 - 2³ = 690268987679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690268987637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345134493843 + 345134493844.

It is an arithmetic number, because the mean of its divisors is an integer number (345134493844).

Almost surely, 2^690268987687 is an apocalyptic number.

690268987687 is a deficient number, since it is larger than the sum of its proper divisors (1).

690268987687 is an equidigital number, since it uses as much as digits as its factorization.

690268987687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 877879296, while the sum is 76.

The spelling of 690268987687 in words is "six hundred ninety billion, two hundred sixty-eight million, nine hundred eighty-seven thousand, six hundred eighty-seven".