5661988547 has 2 divisors, whose sum is σ = 5661988548. Its totient is φ = 5661988546.

The previous prime is 5661988517. The next prime is 5661988573. The reversal of 5661988547 is 7458891665.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661988547 - 2⁸ = 5661988291 is a prime.

It is a super-2 number, since 2×5661988547² = 64116228612718342418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5661988517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830994273 + 2830994274.

It is an arithmetic number, because the mean of its divisors is an integer number (2830994274).

Almost surely, 2^5661988547 is an apocalyptic number.

5661988547 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661988547 is an equidigital number, since it uses as much as digits as its factorization.

5661988547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 59.

The square root of 5661988547 is about 75246.1862621622. The cubic root of 5661988547 is about 1782.3363407315.

The spelling of 5661988547 in words is "five billion, six hundred sixty-one million, nine hundred eighty-eight thousand, five hundred forty-seven".