5111566156661 has 4 divisors (see below), whose sum is σ = 5380595954400. Its totient is φ = 4842536358924.

The previous prime is 5111566156649. The next prime is 5111566156681. The reversal of 5111566156661 is 1666516651115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5111566156661 - 2⁴² = 713519645557 is a prime.

It is a super-2 number, since 2×5111566156661² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5111566156681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134514898841 + ... + 134514898878.

It is an arithmetic number, because the mean of its divisors is an integer number (1345148988600).

Almost surely, 2^{5111566156661} is an apocalyptic number.

It is an amenable number.

5111566156661 is a deficient number, since it is larger than the sum of its proper divisors (269029797739).

5111566156661 is a wasteful number, since it uses less digits than its factorization.

5111566156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269029797738.

The product of its digits is 972000, while the sum is 50.

The spelling of 5111566156661 in words is "five trillion, one hundred eleven billion, five hundred sixty-six million, one hundred fifty-six thousand, six hundred sixty-one".