66612967 has 4 divisors (see below), whose sum is σ = 66630600. Its totient is φ = 66595336.

The previous prime is 66612961. The next prime is 66612979. The reversal of 66612967 is 76921666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76921666 = 2 ⋅38460833.

It is a cyclic number.

It is not a de Polignac number, because 66612967 - 2¹¹ = 66610919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66612961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592 + ... + 11557.

It is an arithmetic number, because the mean of its divisors is an integer number (16657650).

Almost surely, 2^66612967 is an apocalyptic number.

66612967 is a deficient number, since it is larger than the sum of its proper divisors (17633).

66612967 is a wasteful number, since it uses less digits than its factorization.

66612967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632.

The product of its digits is 163296, while the sum is 43.

The square root of 66612967 is about 8161.6767272418. The cubic root of 66612967 is about 405.3712330536.

The spelling of 66612967 in words is "sixty-six million, six hundred twelve thousand, nine hundred sixty-seven".