511681660 has 48 divisors (see below), whose sum is σ = 1267660800. Its totient is φ = 169773120.

The previous prime is 511681633. The next prime is 511681661. The reversal of 511681660 is 66186115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511681661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54610 + ... + 63289.

It is an arithmetic number, because the mean of its divisors is an integer number (26409600).

Almost surely, 2^511681660 is an apocalyptic number.

It is an amenable number.

511681660 is an abundant number, since it is smaller than the sum of its proper divisors (755979140).

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

511681660 is a wasteful number, since it uses less digits than its factorization.

511681660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117946 (or 117944 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 511681660 is about 22620.3815175607. The cubic root of 511681660 is about 799.8341635419.

The spelling of 511681660 in words is "five hundred eleven million, six hundred eighty-one thousand, six hundred sixty".