5661621583 has 2 divisors, whose sum is σ = 5661621584. Its totient is φ = 5661621582.

The previous prime is 5661621523. The next prime is 5661621587. The reversal of 5661621583 is 3851261665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661621583 - 2¹⁷ = 5661490511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661621587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830810791 + 2830810792.

It is an arithmetic number, because the mean of its divisors is an integer number (2830810792).

Almost surely, 2^5661621583 is an apocalyptic number.

5661621583 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661621583 is an equidigital number, since it uses as much as digits as its factorization.

5661621583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The square root of 5661621583 is about 75243.7478000664. The cubic root of 5661621583 is about 1782.2978343894.

The spelling of 5661621583 in words is "five billion, six hundred sixty-one million, six hundred twenty-one thousand, five hundred eighty-three".