66688254 has 24 divisors (see below), whose sum is σ = 149153472. Its totient is φ = 21512160.

The previous prime is 66688217. The next prime is 66688261. The reversal of 66688254 is 45288666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59199 + ... + 60314.

It is an arithmetic number, because the mean of its divisors is an integer number (6214728).

Almost surely, 2^66688254 is an apocalyptic number.

66688254 is an abundant number, since it is smaller than the sum of its proper divisors (82465218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66688254 is a wasteful number, since it uses less digits than its factorization.

66688254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119552 (or 119549 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 66688254 is about 8166.2876510689. The cubic root of 66688254 is about 405.5238944891.

The spelling of 66688254 in words is "sixty-six million, six hundred eighty-eight thousand, two hundred fifty-four".