668771570 has 16 divisors (see below), whose sum is σ = 1208077848. Its totient is φ = 266555520.

The previous prime is 668771567. The next prime is 668771573. The reversal of 668771570 is 75177866.

It is an interprime number because it is at equal distance from previous prime (668771567) and next prime (668771573).

It can be written as a sum of positive squares in 4 ways, for example, as 580279921 + 88491649 = 24089^2 + 9407^2 .

It is not an unprimeable number, because it can be changed into a prime (668771573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116189 + ... + 121808.

Almost surely, 2^668771570 is an apocalyptic number.

668771570 is a deficient number, since it is larger than the sum of its proper divisors (539306278).

668771570 is a wasteful number, since it uses less digits than its factorization.

668771570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238285.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 668771570 is about 25860.6181287300. The cubic root of 668771570 is about 874.4989000208.

The spelling of 668771570 in words is "six hundred sixty-eight million, seven hundred seventy-one thousand, five hundred seventy".