690636543887 has 2 divisors, whose sum is σ = 690636543888. Its totient is φ = 690636543886.

The previous prime is 690636543851. The next prime is 690636543913. The reversal of 690636543887 is 788345636096.

690636543887 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 690636543887 - 2⁶ = 690636543823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690636543287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345318271943 + 345318271944.

It is an arithmetic number, because the mean of its divisors is an integer number (345318271944).

Almost surely, 2^690636543887 is an apocalyptic number.

690636543887 is a deficient number, since it is larger than the sum of its proper divisors (1).

690636543887 is an equidigital number, since it uses as much as digits as its factorization.

690636543887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156764160, while the sum is 65.

The spelling of 690636543887 in words is "six hundred ninety billion, six hundred thirty-six million, five hundred forty-three thousand, eight hundred eighty-seven".