155145841421 has 2 divisors, whose sum is σ = 155145841422. Its totient is φ = 155145841420.

The previous prime is 155145841399. The next prime is 155145841463. The reversal of 155145841421 is 124148541551.

155145841421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118653380521 + 36492460900 = 344461^2 + 191030^2 .

It is an emirp because it is prime and its reverse (124148541551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155145841421 is a prime.

It is a super-2 number, since 2×155145841421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155145841321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77572920710 + 77572920711.

It is an arithmetic number, because the mean of its divisors is an integer number (77572920711).

Almost surely, 2^155145841421 is an apocalyptic number.

It is an amenable number.

155145841421 is a deficient number, since it is larger than the sum of its proper divisors (1).

155145841421 is an equidigital number, since it uses as much as digits as its factorization.

155145841421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 128000, while the sum is 41.

The spelling of 155145841421 in words is "one hundred fifty-five billion, one hundred forty-five million, eight hundred forty-one thousand, four hundred twenty-one".