155115043645 has 4 divisors (see below), whose sum is σ = 186138052380. Its totient is φ = 124092034912.

The previous prime is 155115043631. The next prime is 155115043667. The reversal of 155115043645 is 546340511551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546340511551 = 347 ⋅1574468333.

It can be written as a sum of positive squares in 2 ways, for example, as 91956317049 + 63158726596 = 303243^2 + 251314^2 .

It is a cyclic number.

It is not a de Polignac number, because 155115043645 - 2⁹ = 155115043133 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 155115043598 and 155115043607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15511504360 + ... + 15511504369.

It is an arithmetic number, because the mean of its divisors is an integer number (46534513095).

Almost surely, 2^155115043645 is an apocalyptic number.

It is an amenable number.

155115043645 is a deficient number, since it is larger than the sum of its proper divisors (31023008735).

155115043645 is an equidigital number, since it uses as much as digits as its factorization.

155115043645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31023008734.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 155115043645 in words is "one hundred fifty-five billion, one hundred fifteen million, forty-three thousand, six hundred forty-five".