66697473 has 8 divisors (see below), whose sum is σ = 89299936. Its totient is φ = 44280000.

The previous prime is 66697469. The next prime is 66697489. The reversal of 66697473 is 37479666.

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

It is not a de Polignac number, because 66697473 - 2² = 66697469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66697403) 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, 45403 + ... + 46848.

It is an arithmetic number, because the mean of its divisors is an integer number (11162492).

Almost surely, 2^66697473 is an apocalyptic number.

It is an amenable number.

66697473 is a deficient number, since it is larger than the sum of its proper divisors (22602463).

66697473 is a wasteful number, since it uses less digits than its factorization.

66697473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92495.

The product of its digits is 1143072, while the sum is 48.

The square root of 66697473 is about 8166.8520863304. The cubic root of 66697473 is about 405.5425802011.

The spelling of 66697473 in words is "sixty-six million, six hundred ninety-seven thousand, four hundred seventy-three".