5111606661 has 16 divisors (see below), whose sum is σ = 7798425600. Its totient is φ = 2917426608.

The previous prime is 5111606627. The next prime is 5111606681. The reversal of 5111606661 is 1666061115.

It is not a de Polignac number, because 5111606661 - 2¹⁰ = 5111605637 is a prime.

It is a super-2 number, since 2×5111606661² = 52257045313559137842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5111606681) 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, 127441 + ... + 162678.

It is an arithmetic number, because the mean of its divisors is an integer number (487401600).

Almost surely, 2^5111606661 is an apocalyptic number.

It is an amenable number.

5111606661 is a deficient number, since it is larger than the sum of its proper divisors (2686818939).

5111606661 is a wasteful number, since it uses less digits than its factorization.

5111606661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290968.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 5111606661 is about 71495.5009843277. The cubic root of 5111606661 is about 1722.6054191630.

Adding to 5111606661 its reverse (1666061115), we get a palindrome (6777667776).

The spelling of 5111606661 in words is "five billion, one hundred eleven million, six hundred six thousand, six hundred sixty-one".