690288206477 has 2 divisors, whose sum is σ = 690288206478. Its totient is φ = 690288206476.

The previous prime is 690288206453. The next prime is 690288206519. The reversal of 690288206477 is 774602882096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464277341641 + 226010864836 = 681379^2 + 475406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690288206477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690288206677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345144103238 + 345144103239.

It is an arithmetic number, because the mean of its divisors is an integer number (345144103239).

Almost surely, 2^690288206477 is an apocalyptic number.

It is an amenable number.

690288206477 is a deficient number, since it is larger than the sum of its proper divisors (1).

690288206477 is an equidigital number, since it uses as much as digits as its factorization.

690288206477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 690288206477 in words is "six hundred ninety billion, two hundred eighty-eight million, two hundred six thousand, four hundred seventy-seven".