66690873 has 24 divisors (see below), whose sum is σ = 98473856. Its totient is φ = 43480800.

The previous prime is 66690859. The next prime is 66690901. The reversal of 66690873 is 37809666.

It is not a de Polignac number, because 66690873 - 2¹⁰ = 66689849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66690073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181536 + ... + 181902.

Almost surely, 2^66690873 is an apocalyptic number.

It is an amenable number.

66690873 is a deficient number, since it is larger than the sum of its proper divisors (31782983).

66690873 is a wasteful number, since it uses less digits than its factorization.

66690873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66690873 is about 8166.4480038754. The cubic root of 66690873 is about 405.5292030360.

The spelling of 66690873 in words is "sixty-six million, six hundred ninety thousand, eight hundred seventy-three".