1361666155 has 4 divisors (see below), whose sum is σ = 1633999392. Its totient is φ = 1089332920.

The previous prime is 1361666149. The next prime is 1361666161. The reversal of 1361666155 is 5516661631.

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

It is an interprime number because it is at equal distance from previous prime (1361666149) and next prime (1361666161).

It is not a de Polignac number, because 1361666155 - 2¹¹ = 1361664107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136166611 + ... + 136166620.

It is an arithmetic number, because the mean of its divisors is an integer number (408499848).

Almost surely, 2^1361666155 is an apocalyptic number.

1361666155 is a deficient number, since it is larger than the sum of its proper divisors (272333237).

1361666155 is an equidigital number, since it uses as much as digits as its factorization.

1361666155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272333236.

The product of its digits is 97200, while the sum is 40.

The square root of 1361666155 is about 36900.7609000140. The cubic root of 1361666155 is about 1108.3839142248.

The spelling of 1361666155 in words is "one billion, three hundred sixty-one million, six hundred sixty-six thousand, one hundred fifty-five".