66979427 has 8 divisors (see below), whose sum is σ = 73570560. Its totient is φ = 60694920.

The previous prime is 66979417. The next prime is 66979433. The reversal of 66979427 is 72497966.

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

It is a cyclic number.

It is not a de Polignac number, because 66979427 - 2⁴ = 66979411 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66979417) 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, 76199 + ... + 77072.

It is an arithmetic number, because the mean of its divisors is an integer number (9196320).

Almost surely, 2^66979427 is an apocalyptic number.

66979427 is a deficient number, since it is larger than the sum of its proper divisors (6591133).

66979427 is a wasteful number, since it uses less digits than its factorization.

66979427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153313.

The product of its digits is 1143072, while the sum is 50.

The square root of 66979427 is about 8184.0959793981. The cubic root of 66979427 is about 406.1132345306.

The spelling of 66979427 in words is "sixty-six million, nine hundred seventy-nine thousand, four hundred twenty-seven".