66540554 has 16 divisors (see below), whose sum is σ = 101779200. Its totient is φ = 32617344.

The previous prime is 66540553. The next prime is 66540563. The reversal of 66540554 is 45504566.

It is not an unprimeable number, because it can be changed into a prime (66540553) 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, 71162 + ... + 72090.

It is an arithmetic number, because the mean of its divisors is an integer number (6361200).

Almost surely, 2^66540554 is an apocalyptic number.

66540554 is a deficient number, since it is larger than the sum of its proper divisors (35238646).

66540554 is a wasteful number, since it uses less digits than its factorization.

66540554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 66540554 is about 8157.2393614507. The cubic root of 66540554 is about 405.2242907413.

The spelling of 66540554 in words is "sixty-six million, five hundred forty thousand, five hundred fifty-four".