513121666 has 8 divisors (see below), whose sum is σ = 787582224. Its totient is φ = 250594260.

The previous prime is 513121663. The next prime is 513121667. The reversal of 513121666 is 666121315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (513121663) 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, 2983180 + ... + 2983351.

It is an arithmetic number, because the mean of its divisors is an integer number (98447778).

Almost surely, 2^513121666 is an apocalyptic number.

513121666 is a deficient number, since it is larger than the sum of its proper divisors (274460558).

513121666 is a wasteful number, since it uses less digits than its factorization.

513121666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966576.

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

The square root of 513121666 is about 22652.1889891463. The cubic root of 513121666 is about 800.5837749466.

The spelling of 513121666 in words is "five hundred thirteen million, one hundred twenty-one thousand, six hundred sixty-six".