5991386561 has 4 divisors (see below), whose sum is σ = 5993652672. Its totient is φ = 5989120452.

The previous prime is 5991386549. The next prime is 5991386563. The reversal of 5991386561 is 1656831995.

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 5991386561 - 2¹⁸ = 5991124417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5991386563) 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, 1129085 + ... + 1134378.

It is an arithmetic number, because the mean of its divisors is an integer number (1498413168).

Almost surely, 2^5991386561 is an apocalyptic number.

It is an amenable number.

5991386561 is a deficient number, since it is larger than the sum of its proper divisors (2266111).

5991386561 is a wasteful number, since it uses less digits than its factorization.

5991386561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266110.

The product of its digits is 1749600, while the sum is 53.

The square root of 5991386561 is about 77404.0474458539. The cubic root of 5991386561 is about 1816.2506398843.

The spelling of 5991386561 in words is "five billion, nine hundred ninety-one million, three hundred eighty-six thousand, five hundred sixty-one".