66153438 has 24 divisors (see below), whose sum is σ = 154358568. Its totient is φ = 20354832.

The previous prime is 66153431. The next prime is 66153449. The reversal of 66153438 is 83435166.

66153438 is a `hidden beast` number, since 6 + 615 + 3 + 4 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66153431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141120 + ... + 141587.

It is an arithmetic number, because the mean of its divisors is an integer number (6431607).

Almost surely, 2^66153438 is an apocalyptic number.

66153438 is an abundant number, since it is smaller than the sum of its proper divisors (88205130).

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

66153438 is a wasteful number, since it uses less digits than its factorization.

66153438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282728 (or 282725 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 66153438 is about 8133.4763785235. The cubic root of 66153438 is about 404.4369312954.

The spelling of 66153438 in words is "sixty-six million, one hundred fifty-three thousand, four hundred thirty-eight".