66158406 has 24 divisors (see below), whose sum is σ = 144442584. Its totient is φ = 21883680.

The previous prime is 66158401. The next prime is 66158429. The reversal of 66158406 is 60485166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66158401) 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 11 ways as a sum of consecutive naturals, for example, 11671 + ... + 16386.

It is an arithmetic number, because the mean of its divisors is an integer number (6018441).

Almost surely, 2^66158406 is an apocalyptic number.

66158406 is an abundant number, since it is smaller than the sum of its proper divisors (78284178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66158406 is a wasteful number, since it uses less digits than its factorization.

66158406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28196 (or 28193 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 66158406 is about 8133.7817772547. The cubic root of 66158406 is about 404.4470551954.

It can be divided in two parts, 66158 and 406, that added together give a square (66564 = 258²).

The spelling of 66158406 in words is "sixty-six million, one hundred fifty-eight thousand, four hundred six".