154365661 has 4 divisors (see below), whose sum is σ = 163446012. Its totient is φ = 145285312.

The previous prime is 154365649. The next prime is 154365683. The reversal of 154365661 is 166563451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112763161 + 41602500 = 10619^2 + 6450^2 .

It is a cyclic number.

It is not a de Polignac number, because 154365661 - 2⁹ = 154365149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154365661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154365611) 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 in 3 ways as a sum of consecutive naturals, for example, 4540150 + ... + 4540183.

It is an arithmetic number, because the mean of its divisors is an integer number (40861503).

Almost surely, 2^154365661 is an apocalyptic number.

It is an amenable number.

154365661 is a deficient number, since it is larger than the sum of its proper divisors (9080351).

154365661 is an equidigital number, since it uses as much as digits as its factorization.

154365661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9080350.

The product of its digits is 64800, while the sum is 37.

The square root of 154365661 is about 12424.3978123690. The cubic root of 154365661 is about 536.4347444233.

The spelling of 154365661 in words is "one hundred fifty-four million, three hundred sixty-five thousand, six hundred sixty-one".