511611660 has 96 divisors (see below), whose sum is σ = 1819077120. Its totient is φ = 116938944.

The previous prime is 511611647. The next prime is 511611713. The reversal of 511611660 is 66116115.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63894 + ... + 71453.

It is an arithmetic number, because the mean of its divisors is an integer number (18948720).

Almost surely, 2^511611660 is an apocalyptic number.

It is an amenable number.

511611660 is an abundant number, since it is smaller than the sum of its proper divisors (1307465460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

511611660 is a wasteful number, since it uses less digits than its factorization.

511611660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135372 (or 135364 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 511611660 is about 22618.8341874642. The cubic root of 511611660 is about 799.7976884252.

Adding to 511611660 its reverse (66116115), we get a palindrome (577727775).

It can be divided in two parts, 511 and 611660, that added together give a triangular number (612171 = T₁₁₀₆).

The spelling of 511611660 in words is "five hundred eleven million, six hundred eleven thousand, six hundred sixty".