154560661 has 2 divisors, whose sum is σ = 154560662. Its totient is φ = 154560660.

The previous prime is 154560647. The next prime is 154560689. The reversal of 154560661 is 166065451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96648561 + 57912100 = 9831^2 + 7610^2 .

It is a cyclic number.

It is not a de Polignac number, because 154560661 - 2⁹ = 154560149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154560061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77280330 + 77280331.

It is an arithmetic number, because the mean of its divisors is an integer number (77280331).

Almost surely, 2^154560661 is an apocalyptic number.

It is an amenable number.

154560661 is a deficient number, since it is larger than the sum of its proper divisors (1).

154560661 is an equidigital number, since it uses as much as digits as its factorization.

154560661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 154560661 is about 12432.2427984656. The cubic root of 154560661 is about 536.6605303020.

The spelling of 154560661 in words is "one hundred fifty-four million, five hundred sixty thousand, six hundred sixty-one".