155221436221513 has 2 divisors, whose sum is σ = 155221436221514. Its totient is φ = 155221436221512.

The previous prime is 155221436221429. The next prime is 155221436221673. The reversal of 155221436221513 is 315122634122551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115722687472704 + 39498748748809 = 10757448^2 + 6284803^2 .

It is a cyclic number.

It is not a de Polignac number, because 155221436221513 - 2³⁷ = 155083997268041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155221436221513.

It is not a weakly prime, because it can be changed into another prime (155221436221013) 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, 77610718110756 + 77610718110757.

It is an arithmetic number, because the mean of its divisors is an integer number (77610718110757).

Almost surely, 2^{155221436221513} is an apocalyptic number.

It is an amenable number.

155221436221513 is a deficient number, since it is larger than the sum of its proper divisors (1).

155221436221513 is an equidigital number, since it uses as much as digits as its factorization.

155221436221513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The spelling of 155221436221513 in words is "one hundred fifty-five trillion, two hundred twenty-one billion, four hundred thirty-six million, two hundred twenty-one thousand, five hundred thirteen".