650566551 has 4 divisors (see below), whose sum is σ = 867422072. Its totient is φ = 433711032.

The previous prime is 650566513. The next prime is 650566559. The reversal of 650566551 is 155665056.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 650566551 - 2⁹ = 650566039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650566559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108427756 + ... + 108427761.

It is an arithmetic number, because the mean of its divisors is an integer number (216855518).

Almost surely, 2^650566551 is an apocalyptic number.

650566551 is a deficient number, since it is larger than the sum of its proper divisors (216855521).

650566551 is a wasteful number, since it uses less digits than its factorization.

650566551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216855520.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 650566551 is about 25506.2061271370. The cubic root of 650566551 is about 866.4907084758.

The spelling of 650566551 in words is "six hundred fifty million, five hundred sixty-six thousand, five hundred fifty-one".