66979273 has 4 divisors (see below), whose sum is σ = 67114000. Its totient is φ = 66844548.

The previous prime is 66979259. The next prime is 66979327. The reversal of 66979273 is 37297966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66979273 - 2²¹ = 64882121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66979223) 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, 66615 + ... + 67612.

It is an arithmetic number, because the mean of its divisors is an integer number (16778500).

Almost surely, 2^66979273 is an apocalyptic number.

It is an amenable number.

66979273 is a deficient number, since it is larger than the sum of its proper divisors (134727).

66979273 is a wasteful number, since it uses less digits than its factorization.

66979273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134726.

The product of its digits is 857304, while the sum is 49.

The square root of 66979273 is about 8184.0865709009. The cubic root of 66979273 is about 406.1129232834.

The spelling of 66979273 in words is "sixty-six million, nine hundred seventy-nine thousand, two hundred seventy-three".