5661121501 has 4 divisors (see below), whose sum is σ = 6469853152. Its totient is φ = 4852389852.

The previous prime is 5661121391. The next prime is 5661121507. The reversal of 5661121501 is 1051211665.

It is a happy number.

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 5661121501 - 2⁷ = 5661121373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5661121501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661121507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404365815 + ... + 404365828.

It is an arithmetic number, because the mean of its divisors is an integer number (1617463288).

Almost surely, 2^5661121501 is an apocalyptic number.

It is an amenable number.

5661121501 is a deficient number, since it is larger than the sum of its proper divisors (808731651).

5661121501 is an equidigital number, since it uses as much as digits as its factorization.

5661121501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808731650.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 5661121501 is about 75240.4246465954. The cubic root of 5661121501 is about 1782.2453570031.

The spelling of 5661121501 in words is "five billion, six hundred sixty-one million, one hundred twenty-one thousand, five hundred one".