661162543 has 2 divisors, whose sum is σ = 661162544. Its totient is φ = 661162542.

The previous prime is 661162529. The next prime is 661162547. The reversal of 661162543 is 345261166.

661162543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661162543 - 2¹⁷ = 661031471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661162499 and 661162508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661162547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330581271 + 330581272.

It is an arithmetic number, because the mean of its divisors is an integer number (330581272).

Almost surely, 2^661162543 is an apocalyptic number.

661162543 is a deficient number, since it is larger than the sum of its proper divisors (1).

661162543 is an equidigital number, since it uses as much as digits as its factorization.

661162543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 661162543 is about 25713.0811650413. The cubic root of 661162543 is about 871.1696704027.

The spelling of 661162543 in words is "six hundred sixty-one million, one hundred sixty-two thousand, five hundred forty-three".