154011661 has 4 divisors (see below), whose sum is σ = 154081692. Its totient is φ = 153941632.

The previous prime is 154011617. The next prime is 154011667. The reversal of 154011661 is 166110451.

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 143161225 + 10850436 = 11965^2 + 3294^2 .

It is a cyclic number.

It is not a de Polignac number, because 154011661 - 2⁹ = 154011149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154011667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31606 + ... + 36151.

It is an arithmetic number, because the mean of its divisors is an integer number (38520423).

Almost surely, 2^154011661 is an apocalyptic number.

It is an amenable number.

154011661 is a deficient number, since it is larger than the sum of its proper divisors (70031).

154011661 is an equidigital number, since it uses as much as digits as its factorization.

154011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70030.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 154011661 is about 12410.1434721763. The cubic root of 154011661 is about 536.0243698079.

The spelling of 154011661 in words is "one hundred fifty-four million, eleven thousand, six hundred sixty-one".