690288206677 has 2 divisors, whose sum is σ = 690288206678. Its totient is φ = 690288206676.

The previous prime is 690288206519. The next prime is 690288206723. The reversal of 690288206677 is 776602882096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401397006481 + 288891200196 = 633559^2 + 537486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690288206677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690288206477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345144103338 + 345144103339.

It is an arithmetic number, because the mean of its divisors is an integer number (345144103339).

Almost surely, 2^690288206677 is an apocalyptic number.

It is an amenable number.

690288206677 is a deficient number, since it is larger than the sum of its proper divisors (1).

690288206677 is an equidigital number, since it uses as much as digits as its factorization.

690288206677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 690288206677 in words is "six hundred ninety billion, two hundred eighty-eight million, two hundred six thousand, six hundred seventy-seven".