516553661 has 8 divisors (see below), whose sum is σ = 557047680. Its totient is φ = 476168112.

The previous prime is 516553591. The next prime is 516553663. The reversal of 516553661 is 166355615.

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 516553661 - 2¹⁴ = 516537277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516553663) 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, 17081 + ... + 36398.

It is an arithmetic number, because the mean of its divisors is an integer number (69630960).

Almost surely, 2^516553661 is an apocalyptic number.

It is an amenable number.

516553661 is a deficient number, since it is larger than the sum of its proper divisors (40494019).

516553661 is a wasteful number, since it uses less digits than its factorization.

516553661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54235.

The product of its digits is 81000, while the sum is 38.

The square root of 516553661 is about 22727.8168991217. The cubic root of 516553661 is about 802.3647017824.

The spelling of 516553661 in words is "five hundred sixteen million, five hundred fifty-three thousand, six hundred sixty-one".