155665043 has 16 divisors (see below), whose sum is σ = 170557440. Its totient is φ = 141523200.

The previous prime is 155665021. The next prime is 155665049. The reversal of 155665043 is 340566551.

It is a cyclic number.

It is not a de Polignac number, because 155665043 - 2⁶ = 155664979 is a prime.

It is a super-2 number, since 2×155665043² = 48463211224383698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155664994 and 155665012.

It is not an unprimeable number, because it can be changed into a prime (155665049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73763 + ... + 75843.

It is an arithmetic number, because the mean of its divisors is an integer number (10659840).

Almost surely, 2^155665043 is an apocalyptic number.

155665043 is a deficient number, since it is larger than the sum of its proper divisors (14892397).

155665043 is a wasteful number, since it uses less digits than its factorization.

155665043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 155665043 is about 12476.5797797313. The cubic root of 155665043 is about 537.9356977823.

The spelling of 155665043 in words is "one hundred fifty-five million, six hundred sixty-five thousand, forty-three".