516166121 has 8 divisors (see below), whose sum is σ = 551544840. Its totient is φ = 481344768.

The previous prime is 516166117. The next prime is 516166129. The reversal of 516166121 is 121661615.

It can be written as a sum of positive squares in 4 ways, for example, as 221563225 + 294602896 = 14885^2 + 17164^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 516166121 - 2² = 516166117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516166129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137426 + ... + 141131.

It is an arithmetic number, because the mean of its divisors is an integer number (68943105).

Almost surely, 2^516166121 is an apocalyptic number.

It is an amenable number.

516166121 is a deficient number, since it is larger than the sum of its proper divisors (35378719).

516166121 is a wasteful number, since it uses less digits than its factorization.

516166121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278683.

The product of its digits is 2160, while the sum is 29.

The square root of 516166121 is about 22719.2896235776. The cubic root of 516166121 is about 802.1639958122.

The spelling of 516166121 in words is "five hundred sixteen million, one hundred sixty-six thousand, one hundred twenty-one".