516666001 has 4 divisors (see below), whose sum is σ = 534482100. Its totient is φ = 498849904.

The previous prime is 516665999. The next prime is 516666013. The reversal of 516666001 is 100666615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 125417601 + 391248400 = 11199^2 + 19780^2 .

It is a cyclic number.

It is not a de Polignac number, because 516666001 - 2¹ = 516665999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516666701) 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, 8908006 + ... + 8908063.

It is an arithmetic number, because the mean of its divisors is an integer number (133620525).

Almost surely, 2^516666001 is an apocalyptic number.

It is an amenable number.

516666001 is a deficient number, since it is larger than the sum of its proper divisors (17816099).

516666001 is a wasteful number, since it uses less digits than its factorization.

516666001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17816098.

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

The square root of 516666001 is about 22730.2881855906. The cubic root of 516666001 is about 802.4228636113.

The spelling of 516666001 in words is "five hundred sixteen million, six hundred sixty-six thousand, one".