511550661 has 32 divisors (see below), whose sum is σ = 741565440. Its totient is φ = 312609024.

The previous prime is 511550653. The next prime is 511550671. The reversal of 511550661 is 166055115.

It is not a de Polignac number, because 511550661 - 2³ = 511550653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511550671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276040 + ... + 277886.

It is an arithmetic number, because the mean of its divisors is an integer number (23173920).

Almost surely, 2^511550661 is an apocalyptic number.

It is an amenable number.

511550661 is a deficient number, since it is larger than the sum of its proper divisors (230014779).

511550661 is a wasteful number, since it uses less digits than its factorization.

511550661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 511550661 is about 22617.4857355985. The cubic root of 511550661 is about 799.7659007745.

The spelling of 511550661 in words is "five hundred eleven million, five hundred fifty thousand, six hundred sixty-one".