5651165661 has 4 divisors (see below), whose sum is σ = 7534887552. Its totient is φ = 3767443772.

The previous prime is 5651165633. The next prime is 5651165699. The reversal of 5651165661 is 1665611565.

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 5651165661 - 2¹⁷ = 5651034589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651165161) 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, 941860941 + ... + 941860946.

It is an arithmetic number, because the mean of its divisors is an integer number (1883721888).

Almost surely, 2^5651165661 is an apocalyptic number.

It is an amenable number.

5651165661 is a deficient number, since it is larger than the sum of its proper divisors (1883721891).

5651165661 is a wasteful number, since it uses less digits than its factorization.

5651165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883721890.

The product of its digits is 162000, while the sum is 42.

The square root of 5651165661 is about 75174.2353536103. The cubic root of 5651165661 is about 1781.1999715983.

The spelling of 5651165661 in words is "five billion, six hundred fifty-one million, one hundred sixty-five thousand, six hundred sixty-one".