155790065 has 4 divisors (see below), whose sum is σ = 186948084. Its totient is φ = 124632048.

The previous prime is 155790043. The next prime is 155790073. The reversal of 155790065 is 560097551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560097551 = 13 ⋅43084427.

It can be written as a sum of positive squares in 2 ways, for example, as 88435216 + 67354849 = 9404^2 + 8207^2 .

It is a cyclic number.

It is not a de Polignac number, because 155790065 - 2¹⁶ = 155724529 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, 15579002 + ... + 15579011.

It is an arithmetic number, because the mean of its divisors is an integer number (46737021).

Almost surely, 2^155790065 is an apocalyptic number.

It is an amenable number.

155790065 is a deficient number, since it is larger than the sum of its proper divisors (31158019).

155790065 is an equidigital number, since it uses as much as digits as its factorization.

155790065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31158018.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 155790065 is about 12481.5890414642. The cubic root of 155790065 is about 538.0796731597.

The spelling of 155790065 in words is "one hundred fifty-five million, seven hundred ninety thousand, sixty-five".