66974911 has 8 divisors (see below), whose sum is σ = 69851264. Its totient is φ = 64143360.

The previous prime is 66974909. The next prime is 66974959. The reversal of 66974911 is 11947966.

It is a happy number.

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 66974911 - 2¹ = 66974909 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 (66975911) 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, 8130 + ... + 14143.

It is an arithmetic number, because the mean of its divisors is an integer number (8731408).

Almost surely, 2^66974911 is an apocalyptic number.

66974911 is a deficient number, since it is larger than the sum of its proper divisors (2876353).

66974911 is a wasteful number, since it uses less digits than its factorization.

66974911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22401.

The product of its digits is 81648, while the sum is 43.

The square root of 66974911 is about 8183.8200737797. The cubic root of 66974911 is about 406.1041071081.

The spelling of 66974911 in words is "sixty-six million, nine hundred seventy-four thousand, nine hundred eleven".