66967491 has 8 divisors (see below), whose sum is σ = 89328640. Its totient is φ = 44625672.

The previous prime is 66967489. The next prime is 66967507. The reversal of 66967491 is 19476966.

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

It is not a de Polignac number, because 66967491 - 2¹ = 66967489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66967491.

It is not an unprimeable number, because it can be changed into a prime (66967091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8550 + ... + 14388.

It is an arithmetic number, because the mean of its divisors is an integer number (11166080).

Almost surely, 2^66967491 is an apocalyptic number.

66967491 is a deficient number, since it is larger than the sum of its proper divisors (22361149).

66967491 is a wasteful number, since it uses less digits than its factorization.

66967491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9665.

The product of its digits is 489888, while the sum is 48.

The square root of 66967491 is about 8183.3667276983. The cubic root of 66967491 is about 406.0891094336.

The spelling of 66967491 in words is "sixty-six million, nine hundred sixty-seven thousand, four hundred ninety-one".