516011661 has 16 divisors (see below), whose sum is σ = 833958720. Its totient is φ = 312734160.

The previous prime is 516011623. The next prime is 516011707. The reversal of 516011661 is 166110615.

516011661 is a `hidden beast` number, since 51 + 601 + 1 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 516011661 - 2⁶ = 516011597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516011621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 868410 + ... + 869003.

It is an arithmetic number, because the mean of its divisors is an integer number (52122420).

Almost surely, 2^516011661 is an apocalyptic number.

It is an amenable number.

516011661 is a deficient number, since it is larger than the sum of its proper divisors (317947059).

516011661 is a wasteful number, since it uses less digits than its factorization.

516011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737433 (or 1737427 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 516011661 is about 22715.8900552014. The cubic root of 516011661 is about 802.0839733757.

The spelling of 516011661 in words is "five hundred sixteen million, eleven thousand, six hundred sixty-one".