5651661565 has 8 divisors (see below), whose sum is σ = 7398538848. Its totient is φ = 4110299280.

The previous prime is 5651661559. The next prime is 5651661571.

5651661565 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (5651661559) and next prime (5651661571).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-5651661565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51378687 + ... + 51378796.

It is an arithmetic number, because the mean of its divisors is an integer number (924817356).

Almost surely, 2^5651661565 is an apocalyptic number.

5651661565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5651661565 is a deficient number, since it is larger than the sum of its proper divisors (1746877283).

5651661565 is a wasteful number, since it uses less digits than its factorization.

5651661565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102757499.

The product of its digits is 810000, while the sum is 46.

The square root of 5651661565 is about 75177.5336453651. The cubic root of 5651661565 is about 1781.2520716668.

The spelling of 5651661565 in words is "five billion, six hundred fifty-one million, six hundred sixty-one thousand, five hundred sixty-five".