516366661 has 8 divisors (see below), whose sum is σ = 530712864. Its totient is φ = 502126800.

The previous prime is 516366649. The next prime is 516366677. The reversal of 516366661 is 166663615.

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 516366661 - 2¹⁷ = 516235589 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 (516366161) 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, 16690 + ... + 36211.

It is an arithmetic number, because the mean of its divisors is an integer number (66339108).

Almost surely, 2^516366661 is an apocalyptic number.

It is an amenable number.

516366661 is a deficient number, since it is larger than the sum of its proper divisors (14346203).

516366661 is a wasteful number, since it uses less digits than its factorization.

516366661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53171.

The product of its digits is 116640, while the sum is 40.

The square root of 516366661 is about 22723.7026252325. The cubic root of 516366661 is about 802.2678675003.

It can be divided in two parts, 5163 and 66661, that added together give a square (71824 = 268²).

The spelling of 516366661 in words is "five hundred sixteen million, three hundred sixty-six thousand, six hundred sixty-one".