66540570 has 32 divisors (see below), whose sum is σ = 164851200. Its totient is φ = 17171520.

The previous prime is 66540563. The next prime is 66540653. The reversal of 66540570 is 7504566.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34845 + ... + 36704.

It is an arithmetic number, because the mean of its divisors is an integer number (5151600).

Almost surely, 2^66540570 is an apocalyptic number.

66540570 is an abundant number, since it is smaller than the sum of its proper divisors (98310630).

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

66540570 is a wasteful number, since it uses less digits than its factorization.

66540570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71590.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 66540570 is about 8157.2403421746. The cubic root of 66540570 is about 405.2243232207.

The spelling of 66540570 in words is "sixty-six million, five hundred forty thousand, five hundred seventy".