510121666 has 4 divisors (see below), whose sum is σ = 765182502. Its totient is φ = 255060832.

The previous prime is 510121637. The next prime is 510121673. The reversal of 510121666 is 666121015.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 423166041 + 86955625 = 20571^2 + 9325^2 .

It is a super-2 number, since 2×510121666² = 520448228245231112, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 127530415 + ... + 127530418.

Almost surely, 2^510121666 is an apocalyptic number.

510121666 is a deficient number, since it is larger than the sum of its proper divisors (255060836).

510121666 is a wasteful number, since it uses less digits than its factorization.

510121666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255060835.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 510121666 is about 22585.8731511536. The cubic root of 510121666 is about 799.0205022613.

The spelling of 510121666 in words is "five hundred ten million, one hundred twenty-one thousand, six hundred sixty-six".