20615602097 has 2 divisors, whose sum is σ = 20615602098. Its totient is φ = 20615602096.

The previous prime is 20615602093. The next prime is 20615602199. The reversal of 20615602097 is 79020651602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20348737201 + 266864896 = 142649^2 + 16336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20615602097 - 2² = 20615602093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20615602097.

It is not a weakly prime, because it can be changed into another prime (20615602093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10307801048 + 10307801049.

It is an arithmetic number, because the mean of its divisors is an integer number (10307801049).

Almost surely, 2^20615602097 is an apocalyptic number.

It is an amenable number.

20615602097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20615602097 is an equidigital number, since it uses as much as digits as its factorization.

20615602097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 20615602097 in words is "twenty billion, six hundred fifteen million, six hundred two thousand, ninety-seven".