20615213015603 has 2 divisors, whose sum is σ = 20615213015604. Its totient is φ = 20615213015602.

The previous prime is 20615213015569. The next prime is 20615213015623. The reversal of 20615213015603 is 30651031251602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20615213015603 - 2¹⁰ = 20615213014579 is a prime.

It is not a weakly prime, because it can be changed into another prime (20615213015623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307606507801 + 10307606507802.

It is an arithmetic number, because the mean of its divisors is an integer number (10307606507802).

Almost surely, 2^{20615213015603} is an apocalyptic number.

20615213015603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20615213015603 is an equidigital number, since it uses as much as digits as its factorization.

20615213015603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 20615213015603 in words is "twenty trillion, six hundred fifteen billion, two hundred thirteen million, fifteen thousand, six hundred three".