1620611228413 has 2 divisors, whose sum is σ = 1620611228414. Its totient is φ = 1620611228412.

The previous prime is 1620611228381. The next prime is 1620611228419. The reversal of 1620611228413 is 3148221160261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1617686365689 + 2924862724 = 1271883^2 + 54082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620611228413 - 2⁵ = 1620611228381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620611228419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810305614206 + 810305614207.

It is an arithmetic number, because the mean of its divisors is an integer number (810305614207).

Almost surely, 2^{1620611228413} is an apocalyptic number.

It is an amenable number.

1620611228413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620611228413 is an equidigital number, since it uses as much as digits as its factorization.

1620611228413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

Adding to 1620611228413 its reverse (3148221160261), we get a palindrome (4768832388674).

The spelling of 1620611228413 in words is "one trillion, six hundred twenty billion, six hundred eleven million, two hundred twenty-eight thousand, four hundred thirteen".