66681123 has 8 divisors (see below), whose sum is σ = 94138128. Its totient is φ = 41839104.

The previous prime is 66681107. The next prime is 66681133. The reversal of 66681123 is 32118666.

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

It is not a de Polignac number, because 66681123 - 2⁴ = 66681107 is a prime.

It is a super-2 number, since 2×66681123² = 8892744329082258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66681133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653686 + ... + 653787.

It is an arithmetic number, because the mean of its divisors is an integer number (11767266).

Almost surely, 2^66681123 is an apocalyptic number.

66681123 is a deficient number, since it is larger than the sum of its proper divisors (27457005).

66681123 is a wasteful number, since it uses less digits than its factorization.

66681123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307493.

The product of its digits is 10368, while the sum is 33.

The square root of 66681123 is about 8165.8510272965. The cubic root of 66681123 is about 405.5094396998.

Adding to 66681123 its reverse (32118666), we get a palindrome (98799789).

The spelling of 66681123 in words is "sixty-six million, six hundred eighty-one thousand, one hundred twenty-three".