5661121265673 has 4 divisors (see below), whose sum is σ = 7548161687568. Its totient is φ = 3774080843780.

The previous prime is 5661121265617. The next prime is 5661121265773. The reversal of 5661121265673 is 3765621211665.

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 5661121265673 - 2¹⁸ = 5661121003529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5661121265273) 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, 943520210943 + ... + 943520210948.

It is an arithmetic number, because the mean of its divisors is an integer number (1887040421892).

Almost surely, 2^{5661121265673} is an apocalyptic number.

It is an amenable number.

5661121265673 is a deficient number, since it is larger than the sum of its proper divisors (1887040421895).

5661121265673 is a wasteful number, since it uses less digits than its factorization.

5661121265673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887040421894.

The product of its digits is 2721600, while the sum is 51.

The spelling of 5661121265673 in words is "five trillion, six hundred sixty-one billion, one hundred twenty-one million, two hundred sixty-five thousand, six hundred seventy-three".