66518434 has 4 divisors (see below), whose sum is σ = 99777654. Its totient is φ = 33259216.

The previous prime is 66518423. The next prime is 66518443. The reversal of 66518434 is 43481566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 56927025 + 9591409 = 7545^2 + 3097^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66518393 and 66518402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16629607 + ... + 16629610.

Almost surely, 2^66518434 is an apocalyptic number.

66518434 is a deficient number, since it is larger than the sum of its proper divisors (33259220).

66518434 is a wasteful number, since it uses less digits than its factorization.

66518434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33259219.

The product of its digits is 69120, while the sum is 37.

The square root of 66518434 is about 8155.8833978914. The cubic root of 66518434 is about 405.1793830161.

The spelling of 66518434 in words is "sixty-six million, five hundred eighteen thousand, four hundred thirty-four".