66764914 has 4 divisors (see below), whose sum is σ = 100147374. Its totient is φ = 33382456.

The previous prime is 66764911. The next prime is 66764923. The reversal of 66764914 is 41946766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41946766 = 2 ⋅20973383.

It can be written as a sum of positive squares in only one way, i.e., 66699889 + 65025 = 8167^2 + 255^2 .

It is not an unprimeable number, because it can be changed into a prime (66764911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16691227 + ... + 16691230.

Almost surely, 2^66764914 is an apocalyptic number.

66764914 is a deficient number, since it is larger than the sum of its proper divisors (33382460).

66764914 is a wasteful number, since it uses less digits than its factorization.

66764914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33382459.

The product of its digits is 217728, while the sum is 43.

The square root of 66764914 is about 8170.9799901848. The cubic root of 66764914 is about 405.6792219794.

The spelling of 66764914 in words is "sixty-six million, seven hundred sixty-four thousand, nine hundred fourteen".