660651871 has 16 divisors (see below), whose sum is σ = 762917760. Its totient is φ = 566385120.

The previous prime is 660651857. The next prime is 660651883. The reversal of 660651871 is 178156066.

It is a cyclic number.

It is not a de Polignac number, because 660651871 - 2⁷ = 660651743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660651811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10365 + ... + 37798.

It is an arithmetic number, because the mean of its divisors is an integer number (47682360).

Almost surely, 2^660651871 is an apocalyptic number.

660651871 is a deficient number, since it is larger than the sum of its proper divisors (102265889).

660651871 is a wasteful number, since it uses less digits than its factorization.

660651871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48246.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 660651871 is about 25703.1490483170. The cubic root of 660651871 is about 870.9453198494.

The spelling of 660651871 in words is "six hundred sixty million, six hundred fifty-one thousand, eight hundred seventy-one".