650505551 has 2 divisors, whose sum is σ = 650505552. Its totient is φ = 650505550.

The previous prime is 650505509. The next prime is 650505553. The reversal of 650505551 is 155505056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 650505551 - 2²⁶ = 583396687 is a prime.

Together with 650505553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (650505553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325252775 + 325252776.

It is an arithmetic number, because the mean of its divisors is an integer number (325252776).

Almost surely, 2^650505551 is an apocalyptic number.

650505551 is a deficient number, since it is larger than the sum of its proper divisors (1).

650505551 is an equidigital number, since it uses as much as digits as its factorization.

650505551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 650505551 is about 25505.0103117015. The cubic root of 650505551 is about 866.4636256276.

The spelling of 650505551 in words is "six hundred fifty million, five hundred five thousand, five hundred fifty-one".