66400154 has 8 divisors (see below), whose sum is σ = 99640128. Its totient is φ = 33186780.

The previous prime is 66400151. The next prime is 66400157. The reversal of 66400154 is 45100466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66400151) and next prime (66400157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66400151) 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, 1679 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (12455016).

Almost surely, 2^66400154 is an apocalyptic number.

66400154 is a deficient number, since it is larger than the sum of its proper divisors (33239974).

66400154 is a wasteful number, since it uses less digits than its factorization.

66400154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66400154 is about 8148.6289644332. The cubic root of 66400154 is about 404.9390834559.

The spelling of 66400154 in words is "sixty-six million, four hundred thousand, one hundred fifty-four".