66540512 has 24 divisors (see below), whose sum is σ = 131815656. Its totient is φ = 33063552.

The previous prime is 66540511. The next prime is 66540521. The reversal of 66540512 is 21504566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66540511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163 + ... + 11594.

It is an arithmetic number, because the mean of its divisors is an integer number (5492319).

Almost surely, 2^66540512 is an apocalyptic number.

It is an amenable number.

66540512 is a deficient number, since it is larger than the sum of its proper divisors (65275144).

66540512 is a wasteful number, since it uses less digits than its factorization.

66540512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12930 (or 12922 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 66540512 is about 8157.2367870499. The cubic root of 66540512 is about 405.2242054829.

The spelling of 66540512 in words is "sixty-six million, five hundred forty thousand, five hundred twelve".