1620611235613 has 2 divisors, whose sum is σ = 1620611235614. Its totient is φ = 1620611235612.

The previous prime is 1620611235539. The next prime is 1620611235643. The reversal of 1620611235613 is 3165321160261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1363726477369 + 256884758244 = 1167787^2 + 506838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620611235613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620611235643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810305617806 + 810305617807.

It is an arithmetic number, because the mean of its divisors is an integer number (810305617807).

Almost surely, 2^{1620611235613} is an apocalyptic number.

It is an amenable number.

1620611235613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620611235613 is an equidigital number, since it uses as much as digits as its factorization.

1620611235613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

Adding to 1620611235613 its reverse (3165321160261), we get a palindrome (4785932395874).

The spelling of 1620611235613 in words is "one trillion, six hundred twenty billion, six hundred eleven million, two hundred thirty-five thousand, six hundred thirteen".