666187070 has 16 divisors (see below), whose sum is σ = 1201447728. Its totient is φ = 265961280.

The previous prime is 666187061. The next prime is 666187073. The reversal of 666187070 is 70781666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666187073) 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, 58724 + ... + 69143.

It is an arithmetic number, because the mean of its divisors is an integer number (75090483).

Almost surely, 2^666187070 is an apocalyptic number.

666187070 is a deficient number, since it is larger than the sum of its proper divisors (535260658).

666187070 is a wasteful number, since it uses less digits than its factorization.

666187070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128395.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 666187070 is about 25810.5999542823. The cubic root of 666187070 is about 873.3709313430.

The spelling of 666187070 in words is "six hundred sixty-six million, one hundred eighty-seven thousand, seventy".