154666421 has 16 divisors (see below), whose sum is σ = 198637824. Its totient is φ = 117051264.

The previous prime is 154666417. The next prime is 154666427. The reversal of 154666421 is 124666451.

It is a cyclic number.

It is not a de Polignac number, because 154666421 - 2² = 154666417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154666427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34856 + ... + 39041.

It is an arithmetic number, because the mean of its divisors is an integer number (12414864).

Almost surely, 2^154666421 is an apocalyptic number.

It is an amenable number.

154666421 is a deficient number, since it is larger than the sum of its proper divisors (43971403).

154666421 is a wasteful number, since it uses less digits than its factorization.

154666421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73940.

The product of its digits is 34560, while the sum is 35.

The square root of 154666421 is about 12436.4955272778. The cubic root of 154666421 is about 536.7829078778.

The spelling of 154666421 in words is "one hundred fifty-four million, six hundred sixty-six thousand, four hundred twenty-one".