149666401 has 4 divisors (see below), whose sum is σ = 157543600. Its totient is φ = 141789204.

The previous prime is 149666399. The next prime is 149666411. The reversal of 149666401 is 104666941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149666401 - 2¹ = 149666399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149666411) 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, 3938571 + ... + 3938608.

It is an arithmetic number, because the mean of its divisors is an integer number (39385900).

Almost surely, 2^149666401 is an apocalyptic number.

It is an amenable number.

149666401 is a deficient number, since it is larger than the sum of its proper divisors (7877199).

149666401 is an equidigital number, since it uses as much as digits as its factorization.

149666401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7877198.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 149666401 is about 12233.8220111296. The cubic root of 149666401 is about 530.9351012975.

The spelling of 149666401 in words is "one hundred forty-nine million, six hundred sixty-six thousand, four hundred one".