690868504225 has 9 divisors (see below), whose sum is σ = 856682098617. Its totient is φ = 552691478640.

The previous prime is 690868504177. The next prime is 690868504247. The reversal of 690868504225 is 522405868096.

The square root of 690868504225 is 831185.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 340328724129 + 350539780096 = 583377^2 + 592064^2 .

It is not a de Polignac number, because 690868504225 - 2¹⁵ = 690868471457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4072807 + ... + 4239043.

Almost surely, 2^690868504225 is an apocalyptic number.

690868504225 is the 831185-th square number.

690868504225 is the 415593-rd centered octagonal number.

It is an amenable number.

690868504225 is a deficient number, since it is larger than the sum of its proper divisors (165813594392).

690868504225 is an frugal number, since it uses more digits than its factorization.

690868504225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332484 (or 166242 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 690868504225 in words is "six hundred ninety billion, eight hundred sixty-eight million, five hundred four thousand, two hundred twenty-five".