66540254 has 16 divisors (see below), whose sum is σ = 110010096. Its totient is φ = 29932800.

The previous prime is 66540247. The next prime is 66540263. The reversal of 66540254 is 45204566.

It is a self number, because there is not a number n which added to its sum of digits gives 66540254.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13457 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (6875631).

Almost surely, 2^66540254 is an apocalyptic number.

66540254 is a deficient number, since it is larger than the sum of its proper divisors (43469842).

66540254 is a wasteful number, since it uses less digits than its factorization.

66540254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31291.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 66540254 is about 8157.2209728559. The cubic root of 66540254 is about 405.2236817519.

The spelling of 66540254 in words is "sixty-six million, five hundred forty thousand, two hundred fifty-four".