669181155 has 8 divisors (see below), whose sum is σ = 1070689872. Its totient is φ = 356896608.

The previous prime is 669181153. The next prime is 669181169. The reversal of 669181155 is 551181966.

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

It is not a de Polignac number, because 669181155 - 2¹ = 669181153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669181153) 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, 22306024 + ... + 22306053.

It is an arithmetic number, because the mean of its divisors is an integer number (133836234).

Almost surely, 2^669181155 is an apocalyptic number.

669181155 is a deficient number, since it is larger than the sum of its proper divisors (401508717).

669181155 is a wasteful number, since it uses less digits than its factorization.

669181155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44612085.

The product of its digits is 64800, while the sum is 42.

The square root of 669181155 is about 25868.5360041886. The cubic root of 669181155 is about 874.6773907296.

The spelling of 669181155 in words is "six hundred sixty-nine million, one hundred eighty-one thousand, one hundred fifty-five".