66666570 has 16 divisors (see below), whose sum is σ = 159999840. Its totient is φ = 17777744.

The previous prime is 66666569. The next prime is 66666629. The reversal of 66666570 is 7566666.

It is a Curzon 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, 1111080 + ... + 1111139.

It is an arithmetic number, because the mean of its divisors is an integer number (9999990).

Almost surely, 2^66666570 is an apocalyptic number.

66666570 is an abundant number, since it is smaller than the sum of its proper divisors (93333270).

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

66666570 is a wasteful number, since it uses less digits than its factorization.

66666570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222229.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 66666570 is about 8164.9598896749. The cubic root of 66666570 is about 405.4799370561.

The spelling of 66666570 in words is "sixty-six million, six hundred sixty-six thousand, five hundred seventy".