668788177 has 4 divisors (see below), whose sum is σ = 708128676. Its totient is φ = 629447680.

The previous prime is 668788151. The next prime is 668788189. The reversal of 668788177 is 771887866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 607573201 + 61214976 = 24649^2 + 7824^2 .

It is a cyclic number.

It is not a de Polignac number, because 668788177 - 2¹⁹ = 668263889 is a prime.

It is a super-4 number, since 4×668788177⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (668788117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19670224 + ... + 19670257.

It is an arithmetic number, because the mean of its divisors is an integer number (177032169).

Almost surely, 2^668788177 is an apocalyptic number.

It is an amenable number.

668788177 is a deficient number, since it is larger than the sum of its proper divisors (39340499).

668788177 is a wasteful number, since it uses less digits than its factorization.

668788177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39340498.

The product of its digits is 6322176, while the sum is 58.

The square root of 668788177 is about 25860.9392134161. The cubic root of 668788177 is about 874.5061385078.

It can be divided in two parts, 6687 and 88177, that added together give a square (94864 = 308²).

The spelling of 668788177 in words is "six hundred sixty-eight million, seven hundred eighty-eight thousand, one hundred seventy-seven".