660700071 has 20 divisors (see below), whose sum is σ = 991347192. Its totient is φ = 438514128.

The previous prime is 660700049. The next prime is 660700109. The reversal of 660700071 is 170007066.

It is not a de Polignac number, because 660700071 - 2¹³ = 660691879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660700871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 421 + ... + 36353.

Almost surely, 2^660700071 is an apocalyptic number.

660700071 is a deficient number, since it is larger than the sum of its proper divisors (330647121).

660700071 is a wasteful number, since it uses less digits than its factorization.

660700071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36172 (or 36163 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 660700071 is about 25704.0866595178. The cubic root of 660700071 is about 870.9665002145.

The spelling of 660700071 in words is "six hundred sixty million, seven hundred thousand, seventy-one".