66540144 has 40 divisors (see below), whose sum is σ = 187523712. Its totient is φ = 20163520.

The previous prime is 66540137. The next prime is 66540151. The reversal of 66540144 is 44104566.

It is an interprime number because it is at equal distance from previous prime (66540137) and next prime (66540151).

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, 62484 + ... + 63539.

Almost surely, 2^66540144 is an apocalyptic number.

It is an amenable number.

66540144 is an abundant number, since it is smaller than the sum of its proper divisors (120983568).

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

66540144 is a wasteful number, since it uses less digits than its factorization.

66540144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126045 (or 126039 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 66540144 is about 8157.2142303608. The cubic root of 66540144 is about 405.2234584554.

The spelling of 66540144 in words is "sixty-six million, five hundred forty thousand, one hundred forty-four".