668095655 has 4 divisors (see below), whose sum is σ = 801714792. Its totient is φ = 534476520.

The previous prime is 668095639. The next prime is 668095669. The reversal of 668095655 is 556590866.

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

It is not a de Polignac number, because 668095655 - 2⁴ = 668095639 is a prime.

It is a super-3 number, since 3×668095655³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66809561 + ... + 66809570.

It is an arithmetic number, because the mean of its divisors is an integer number (200428698).

Almost surely, 2^668095655 is an apocalyptic number.

668095655 is a deficient number, since it is larger than the sum of its proper divisors (133619137).

668095655 is a wasteful number, since it uses less digits than its factorization.

668095655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133619136.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The square root of 668095655 is about 25847.5464019315. The cubic root of 668095655 is about 874.2041874483.

The spelling of 668095655 in words is "six hundred sixty-eight million, ninety-five thousand, six hundred fifty-five".