5651661121 has 4 divisors (see below), whose sum is σ = 5652222912. Its totient is φ = 5651099332.

The previous prime is 5651661109. The next prime is 5651661151. The reversal of 5651661121 is 1211661565.

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 5651661121 - 2¹⁹ = 5651136833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5651661151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265525 + ... + 286018.

It is an arithmetic number, because the mean of its divisors is an integer number (1413055728).

Almost surely, 2^5651661121 is an apocalyptic number.

It is an amenable number.

5651661121 is a deficient number, since it is larger than the sum of its proper divisors (561791).

5651661121 is a wasteful number, since it uses less digits than its factorization.

5651661121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561790.

The product of its digits is 10800, while the sum is 34.

The square root of 5651661121 is about 75177.5306923551. The cubic root of 5651661121 is about 1781.2520250212.

The spelling of 5651661121 in words is "five billion, six hundred fifty-one million, six hundred sixty-one thousand, one hundred twenty-one".