66654873 has 16 divisors (see below), whose sum is σ = 99408000. Its totient is φ = 44139600.

The previous prime is 66654857. The next prime is 66654881. The reversal of 66654873 is 37845666.

It is not a de Polignac number, because 66654873 - 2⁴ = 66654857 is a prime.

It is a super-2 number, since 2×66654873² = 8885744189292258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66654803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4098 + ... + 12251.

It is an arithmetic number, because the mean of its divisors is an integer number (6213000).

Almost surely, 2^66654873 is an apocalyptic number.

It is an amenable number.

66654873 is a deficient number, since it is larger than the sum of its proper divisors (32753127).

66654873 is a wasteful number, since it uses less digits than its factorization.

66654873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16509 (or 16503 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 66654873 is about 8164.2435656955. The cubic root of 66654873 is about 405.4562211405.

The spelling of 66654873 in words is "sixty-six million, six hundred fifty-four thousand, eight hundred seventy-three".