154446661 has 4 divisors (see below), whose sum is σ = 154504012. Its totient is φ = 154389312.

The previous prime is 154446641. The next prime is 154446673. The reversal of 154446661 is 166644451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166644451 = 2111 ⋅78941.

It can be written as a sum of positive squares in 2 ways, for example, as 106213636 + 48233025 = 10306^2 + 6945^2 .

It is a cyclic number.

It is not a de Polignac number, because 154446661 - 2⁵ = 154446629 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 154446661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154446641) 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 in 3 ways as a sum of consecutive naturals, for example, 24426 + ... + 30091.

It is an arithmetic number, because the mean of its divisors is an integer number (38626003).

Almost surely, 2^154446661 is an apocalyptic number.

It is an amenable number.

154446661 is a deficient number, since it is larger than the sum of its proper divisors (57351).

154446661 is an equidigital number, since it uses as much as digits as its factorization.

154446661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57350.

The product of its digits is 69120, while the sum is 37.

The square root of 154446661 is about 12427.6571001939. The cubic root of 154446661 is about 536.5285554781.

It can be divided in two parts, 1544 and 46661, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 154446661 in words is "one hundred fifty-four million, four hundred forty-six thousand, six hundred sixty-one".