5111165661 has 64 divisors (see below), whose sum is σ = 8369940480. Its totient is φ = 2709469440.

The previous prime is 5111165599. The next prime is 5111165669. The reversal of 5111165661 is 1665611115.

It is not a de Polignac number, because 5111165661 - 2⁶ = 5111165597 is a prime.

It is a super-2 number, since 2×5111165661² = 52248028828371133842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5111165669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9078166 + ... + 9078728.

It is an arithmetic number, because the mean of its divisors is an integer number (130780320).

Almost surely, 2^5111165661 is an apocalyptic number.

It is an amenable number.

5111165661 is a deficient number, since it is larger than the sum of its proper divisors (3258774819).

5111165661 is a wasteful number, since it uses less digits than its factorization.

5111165661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026.

The product of its digits is 5400, while the sum is 33.

The square root of 5111165661 is about 71492.4168076587. The cubic root of 5111165661 is about 1722.5558789116. Note that the first 3 decimals are identical.

Adding to 5111165661 its reverse (1665611115), we get a palindrome (6776776776).

The spelling of 5111165661 in words is "five billion, one hundred eleven million, one hundred sixty-five thousand, six hundred sixty-one".