155111001180401 has 4 divisors (see below), whose sum is σ = 177269715634752. Its totient is φ = 132952286726052.

The previous prime is 155111001180383. The next prime is 155111001180433. The reversal of 155111001180401 is 104081100111551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155111001180401 - 2²² = 155110996986097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155111001180481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11079357227165 + ... + 11079357227178.

It is an arithmetic number, because the mean of its divisors is an integer number (44317428908688).

Almost surely, 2^{155111001180401} is an apocalyptic number.

It is an amenable number.

155111001180401 is a deficient number, since it is larger than the sum of its proper divisors (22158714454351).

155111001180401 is an equidigital number, since it uses as much as digits as its factorization.

155111001180401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22158714454350.

The product of its (nonzero) digits is 800, while the sum is 29.

Adding to 155111001180401 its reverse (104081100111551), we get a palindrome (259192101291952).

The spelling of 155111001180401 in words is "one hundred fifty-five trillion, one hundred eleven billion, one million, one hundred eighty thousand, four hundred one".