650647117129 has 9 divisors (see below), whose sum is σ = 653553365511. Its totient is φ = 647753746080.

The previous prime is 650647117117. The next prime is 650647117189. The reversal of 650647117129 is 921711746056.

The square root of 650647117129 is 806627.

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., 489332427529 + 161314689600 = 699523^2 + 401640^2 .

It is not a de Polignac number, because 650647117129 - 2¹¹ = 650647115081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650647117189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 194395434 + ... + 194398780.

Almost surely, 2^650647117129 is an apocalyptic number.

650647117129 is the 806627-th square number.

650647117129 is the 403314-th centered octagonal number.

It is an amenable number.

650647117129 is a deficient number, since it is larger than the sum of its proper divisors (2906248382).

650647117129 is an frugal number, since it uses more digits than its factorization.

650647117129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176 (or 3588 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 49.

Multiplying 650647117129 by its sum of digits (49), we get a square (31881708739321 = 5646389²).

The spelling of 650647117129 in words is "six hundred fifty billion, six hundred forty-seven million, one hundred seventeen thousand, one hundred twenty-nine".