155666145 has 16 divisors (see below), whose sum is σ = 262175040. Its totient is φ = 78652224.

The previous prime is 155666143. The next prime is 155666167. The reversal of 155666145 is 541666551.

It is not a de Polignac number, because 155666145 - 2¹ = 155666143 is a prime.

It is a super-2 number, since 2×155666145² = 48463897398322050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155666143) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 272814 + ... + 273383.

It is an arithmetic number, because the mean of its divisors is an integer number (16385940).

Almost surely, 2^155666145 is an apocalyptic number.

155666145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155666145 is a deficient number, since it is larger than the sum of its proper divisors (106508895).

155666145 is a wasteful number, since it uses less digits than its factorization.

155666145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546224.

The product of its digits is 108000, while the sum is 39.

The square root of 155666145 is about 12476.6239423972. The cubic root of 155666145 is about 537.9369671826.

The spelling of 155666145 in words is "one hundred fifty-five million, six hundred sixty-six thousand, one hundred forty-five".