690165500644 has 9 divisors (see below), whose sum is σ = 1207792533801. Its totient is φ = 345081919560.

The previous prime is 690165500641. The next prime is 690165500699. The reversal of 690165500644 is 446005561096.

The square root of 690165500644 is 830762.

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

It can be written as a sum of positive squares in only one way, i.e., 2791854244 + 687373646400 = 52838^2 + 829080^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690165500594 and 690165500603.

It is not an unprimeable number, because it can be changed into a prime (690165500641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1453834 + ... + 1869214.

Almost surely, 2^690165500644 is an apocalyptic number.

690165500644 is the 830762-nd square number.

It is an amenable number.

690165500644 is a deficient number, since it is larger than the sum of its proper divisors (517627033157).

690165500644 is an frugal number, since it uses more digits than its factorization.

690165500644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830766 (or 415383 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 690165500644 in words is "six hundred ninety billion, one hundred sixty-five million, five hundred thousand, six hundred forty-four".