511632661 has 4 divisors (see below), whose sum is σ = 512788032. Its totient is φ = 510477292.

The previous prime is 511632659. The next prime is 511632679. The reversal of 511632661 is 166236115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 511632661 - 2¹ = 511632659 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 (511642661) 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, 577021 + ... + 577906.

It is an arithmetic number, because the mean of its divisors is an integer number (128197008).

Almost surely, 2^511632661 is an apocalyptic number.

It is an amenable number.

511632661 is a deficient number, since it is larger than the sum of its proper divisors (1155371).

511632661 is a wasteful number, since it uses less digits than its factorization.

511632661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155370.

The product of its digits is 6480, while the sum is 31.

The square root of 511632661 is about 22619.2984197123. The cubic root of 511632661 is about 799.8086318306.

Adding to 511632661 its reverse (166236115), we get a palindrome (677868776).

It can be divided in two parts, 51163 and 2661, that added together give a square (53824 = 232²).

The spelling of 511632661 in words is "five hundred eleven million, six hundred thirty-two thousand, six hundred sixty-one".