155445097125161 has 4 divisors (see below), whose sum is σ = 159236440957524. Its totient is φ = 151653753292800.

The previous prime is 155445097125113. The next prime is 155445097125179. The reversal of 155445097125161 is 161521790544551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45678741546025 + 109766355579136 = 6758605^2 + 10476944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155445097125161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155445097125097 and 155445097125106.

It is not an unprimeable number, because it can be changed into a prime (155445097121161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1895671916120 + ... + 1895671916201.

It is an arithmetic number, because the mean of its divisors is an integer number (39809110239381).

Almost surely, 2^{155445097125161} is an apocalyptic number.

It is an amenable number.

155445097125161 is a deficient number, since it is larger than the sum of its proper divisors (3791343832363).

155445097125161 is an equidigital number, since it uses as much as digits as its factorization.

155445097125161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791343832362.

The product of its (nonzero) digits is 7560000, while the sum is 56.

The spelling of 155445097125161 in words is "one hundred fifty-five trillion, four hundred forty-five billion, ninety-seven million, one hundred twenty-five thousand, one hundred sixty-one".