646990183449 has 49 divisors (see below), whose sum is σ = 1002376240741. Its totient is φ = 417413021580.

The previous prime is 646990183397. The next prime is 646990183453. The reversal of 646990183449 is 944381099646.

The square root of 646990183449 is 804357.

The cubic root of 646990183449 is 8649.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

646990183449 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 9 + 0 + 183 + 449 = 666.

It is not a de Polignac number, because 646990183449 - 2³¹ = 644842699801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646990183459) by changing a digit.

It is a polite number, since it can be written in 48 ways as a sum of consecutive naturals, for example, 20870651064 + ... + 20870651094.

Almost surely, 2^646990183449 is an apocalyptic number.

646990183449 is the 804357-th square number.

646990183449 is the 402179-th centered octagonal number.

It is an amenable number.

646990183449 is a deficient number, since it is larger than the sum of its proper divisors (355386057292).

646990183449 is an frugal number, since it uses more digits than its factorization.

646990183449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 63.

The spelling of 646990183449 in words is "six hundred forty-six billion, nine hundred ninety million, one hundred eighty-three thousand, four hundred forty-nine".