155111324954381 has 2 divisors, whose sum is σ = 155111324954382. Its totient is φ = 155111324954380.

The previous prime is 155111324954353. The next prime is 155111324954389. The reversal of 155111324954381 is 183459423111551.

155111324954381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137285956514281 + 17825368440100 = 11716909^2 + 4222010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155111324954381 is a prime.

It is a super-2 number, since 2×155111324954381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155111324954389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77555662477190 + 77555662477191.

It is an arithmetic number, because the mean of its divisors is an integer number (77555662477191).

Almost surely, 2^{155111324954381} is an apocalyptic number.

It is an amenable number.

155111324954381 is a deficient number, since it is larger than the sum of its proper divisors (1).

155111324954381 is an equidigital number, since it uses as much as digits as its factorization.

155111324954381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 53.

The spelling of 155111324954381 in words is "one hundred fifty-five trillion, one hundred eleven billion, three hundred twenty-four million, nine hundred fifty-four thousand, three hundred eighty-one".