668969155 has 8 divisors (see below), whose sum is σ = 805078512. Its totient is φ = 533631648.

The previous prime is 668969137. The next prime is 668969177. The reversal of 668969155 is 551969866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668969155 - 2⁷ = 668969027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668969096 and 668969105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191052 + ... + 194521.

It is an arithmetic number, because the mean of its divisors is an integer number (100634814).

Almost surely, 2^668969155 is an apocalyptic number.

668969155 is a deficient number, since it is larger than the sum of its proper divisors (136109357).

668969155 is a wasteful number, since it uses less digits than its factorization.

668969155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385925.

The product of its digits is 3499200, while the sum is 55.

The square root of 668969155 is about 25864.4380375836. The cubic root of 668969155 is about 874.5850135555.

It can be divided in two parts, 668969 and 155, that added together give a square (669124 = 818²).

The spelling of 668969155 in words is "six hundred sixty-eight million, nine hundred sixty-nine thousand, one hundred fifty-five".