516661980 has 24 divisors (see below), whose sum is σ = 1446653712. Its totient is φ = 137776512.

The previous prime is 516661973. The next prime is 516661993. The reversal of 516661980 is 89166615.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4305457 + ... + 4305576.

It is an arithmetic number, because the mean of its divisors is an integer number (60277238).

Almost surely, 2^516661980 is an apocalyptic number.

It is an amenable number.

516661980 is an abundant number, since it is smaller than the sum of its proper divisors (929991732).

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

516661980 is a wasteful number, since it uses less digits than its factorization.

516661980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8611045 (or 8611043 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 516661980 is about 22730.1997351541. The cubic root of 516661980 is about 802.4207819630.

The spelling of 516661980 in words is "five hundred sixteen million, six hundred sixty-one thousand, nine hundred eighty".