1620670811719 has 2 divisors, whose sum is σ = 1620670811720. Its totient is φ = 1620670811718.

The previous prime is 1620670811717. The next prime is 1620670811741. The reversal of 1620670811719 is 9171180760261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620670811719 - 2¹ = 1620670811717 is a prime.

It is a super-2 number, since 2×1620670811719² (a number of 25 digits) contains 22 as substring.

Together with 1620670811717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620670811717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810335405859 + 810335405860.

It is an arithmetic number, because the mean of its divisors is an integer number (810335405860).

Almost surely, 2^{1620670811719} is an apocalyptic number.

1620670811719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620670811719 is an equidigital number, since it uses as much as digits as its factorization.

1620670811719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 1620670811719 in words is "one trillion, six hundred twenty billion, six hundred seventy million, eight hundred eleven thousand, seven hundred nineteen".