1620068741 has 2 divisors, whose sum is σ = 1620068742. Its totient is φ = 1620068740.

The previous prime is 1620068729. The next prime is 1620068743. The reversal of 1620068741 is 1478600261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1620062500 + 6241 = 40250^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620068741 - 2³⁰ = 546326917 is a prime.

Together with 1620068743, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620068743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810034370 + 810034371.

It is an arithmetic number, because the mean of its divisors is an integer number (810034371).

Almost surely, 2^1620068741 is an apocalyptic number.

It is an amenable number.

1620068741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620068741 is an equidigital number, since it uses as much as digits as its factorization.

1620068741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1620068741 is about 40250.0775278756. The cubic root of 1620068741 is about 1174.4769039624.

The spelling of 1620068741 in words is "one billion, six hundred twenty million, sixty-eight thousand, seven hundred forty-one".