20612562613 has 2 divisors, whose sum is σ = 20612562614. Its totient is φ = 20612562612.

The previous prime is 20612562569. The next prime is 20612562629. The reversal of 20612562613 is 31626521602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20147815249 + 464747364 = 141943^2 + 21558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20612562613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20612562913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306281306 + 10306281307.

It is an arithmetic number, because the mean of its divisors is an integer number (10306281307).

Almost surely, 2^20612562613 is an apocalyptic number.

It is an amenable number.

20612562613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612562613 is an equidigital number, since it uses as much as digits as its factorization.

20612562613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 20612562613 in words is "twenty billion, six hundred twelve million, five hundred sixty-two thousand, six hundred thirteen".