66709514 has 4 divisors (see below), whose sum is σ = 100064274. Its totient is φ = 33354756.

The previous prime is 66709481. The next prime is 66709529. The reversal of 66709514 is 41590766.

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., 66015625 + 693889 = 8125^2 + 833^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16677377 + ... + 16677380.

Almost surely, 2^66709514 is an apocalyptic number.

66709514 is a deficient number, since it is larger than the sum of its proper divisors (33354760).

66709514 is a wasteful number, since it uses less digits than its factorization.

66709514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33354759.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 66709514 is about 8167.5892404063. The cubic root of 66709514 is about 405.5669831465.

The spelling of 66709514 in words is "sixty-six million, seven hundred nine thousand, five hundred fourteen".