20155200613 has 2 divisors, whose sum is σ = 20155200614. Its totient is φ = 20155200612.

The previous prime is 20155200599. The next prime is 20155200643. The reversal of 20155200613 is 31600255102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19256280289 + 898920324 = 138767^2 + 29982^2 .

It is a cyclic number.

It is not a de Polignac number, because 20155200613 - 2²¹ = 20153103461 is a prime.

It is a super-2 number, since 2×20155200613² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20155200643) 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, 10077600306 + 10077600307.

It is an arithmetic number, because the mean of its divisors is an integer number (10077600307).

Almost surely, 2^20155200613 is an apocalyptic number.

It is an amenable number.

20155200613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155200613 is an equidigital number, since it uses as much as digits as its factorization.

20155200613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20155200613 its reverse (31600255102), we get a palindrome (51755455715).

The spelling of 20155200613 in words is "twenty billion, one hundred fifty-five million, two hundred thousand, six hundred thirteen".