660701291 has 4 divisors (see below), whose sum is σ = 660756312. Its totient is φ = 660646272.

The previous prime is 660701263. The next prime is 660701299. The reversal of 660701291 is 192107066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 192107066 = 2 ⋅96053533.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660701291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660701299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 950 + ... + 36363.

It is an arithmetic number, because the mean of its divisors is an integer number (165189078).

Almost surely, 2^660701291 is an apocalyptic number.

660701291 is a deficient number, since it is larger than the sum of its proper divisors (55021).

660701291 is a wasteful number, since it uses less digits than its factorization.

660701291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55020.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 660701291 is about 25704.1103911417. The cubic root of 660701291 is about 870.9670363016.

The spelling of 660701291 in words is "six hundred sixty million, seven hundred one thousand, two hundred ninety-one".