155530044342391 has 2 divisors, whose sum is σ = 155530044342392. Its totient is φ = 155530044342390.

The previous prime is 155530044342389. The next prime is 155530044342457. The reversal of 155530044342391 is 193243440035551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155530044342391 - 2¹ = 155530044342389 is a prime.

It is a super-2 number, since 2×155530044342391² (a number of 29 digits) contains 22 as substring.

Together with 155530044342389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155530044345391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77765022171195 + 77765022171196.

It is an arithmetic number, because the mean of its divisors is an integer number (77765022171196).

Almost surely, 2^{155530044342391} is an apocalyptic number.

155530044342391 is a deficient number, since it is larger than the sum of its proper divisors (1).

155530044342391 is an equidigital number, since it uses as much as digits as its factorization.

155530044342391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 155530044342391 in words is "one hundred fifty-five trillion, five hundred thirty billion, forty-four million, three hundred forty-two thousand, three hundred ninety-one".