66432381 has 8 divisors (see below), whose sum is σ = 88619040. Its totient is φ = 44266992.

The previous prime is 66432367. The next prime is 66432383. The reversal of 66432381 is 18323466.

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

It is not a de Polignac number, because 66432381 - 2²³ = 58043773 is a prime.

It is a super-2 number, since 2×66432381² = 8826522490658322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4635 + ... + 12423.

It is an arithmetic number, because the mean of its divisors is an integer number (11077380).

Almost surely, 2^66432381 is an apocalyptic number.

It is an amenable number.

66432381 is a deficient number, since it is larger than the sum of its proper divisors (22186659).

66432381 is a wasteful number, since it uses less digits than its factorization.

66432381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635.

The product of its digits is 20736, while the sum is 33.

The square root of 66432381 is about 8150.6061737763. The cubic root of 66432381 is about 405.0045846151.

The spelling of 66432381 in words is "sixty-six million, four hundred thirty-two thousand, three hundred eighty-one".