648045930169 has 15 divisors (see below), whose sum is σ = 712953259615. Its totient is φ = 589044112360.

The previous prime is 648045930163. The next prime is 648045930197. The reversal of 648045930169 is 961039540846.

It is a happy number.

The square root of 648045930169 is 805013.

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., 15683805225 + 632362124944 = 125235^2 + 795212^2 .

It is not a de Polignac number, because 648045930169 - 2²³ = 648037541561 is a prime.

It is a super-2 number, since 2×648045930169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648045930163) by changing a digit.

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 14 ways as a sum of consecutive naturals, for example, 97403247 + ... + 97409899.

Almost surely, 2^648045930169 is an apocalyptic number.

648045930169 is the 805013-rd square number.

648045930169 is the 402507-th centered octagonal number.

It is an amenable number.

648045930169 is a deficient number, since it is larger than the sum of its proper divisors (64907329446).

648045930169 is an frugal number, since it uses more digits than its factorization.

With its predecessor (648045930168) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (6664).

648045930169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13350 (or 6664 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 648045930169 in words is "six hundred forty-eight billion, forty-five million, nine hundred thirty thousand, one hundred sixty-nine".