19555145501 has 2 divisors, whose sum is σ = 19555145502. Its totient is φ = 19555145500.

The previous prime is 19555145497. The next prime is 19555145531. The reversal of 19555145501 is 10554155591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18189916900 + 1365228601 = 134870^2 + 36949^2 .

It is a cyclic number.

It is not a de Polignac number, because 19555145501 - 2² = 19555145497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19555145531) 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, 9777572750 + 9777572751.

It is an arithmetic number, because the mean of its divisors is an integer number (9777572751).

Almost surely, 2^19555145501 is an apocalyptic number.

It is an amenable number.

19555145501 is a deficient number, since it is larger than the sum of its proper divisors (1).

19555145501 is an equidigital number, since it uses as much as digits as its factorization.

19555145501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112500, while the sum is 41.

The spelling of 19555145501 in words is "nineteen billion, five hundred fifty-five million, one hundred forty-five thousand, five hundred one".