1656021164443 has 2 divisors, whose sum is σ = 1656021164444. Its totient is φ = 1656021164442.

The previous prime is 1656021164431. The next prime is 1656021164471. The reversal of 1656021164443 is 3444611206561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1656021164443 - 2²⁹ = 1655484293531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1656021164443.

It is not a weakly prime, because it can be changed into another prime (1656021164423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828010582221 + 828010582222.

It is an arithmetic number, because the mean of its divisors is an integer number (828010582222).

Almost surely, 2^{1656021164443} is an apocalyptic number.

1656021164443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656021164443 is an equidigital number, since it uses as much as digits as its factorization.

1656021164443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 1656021164443 in words is "one trillion, six hundred fifty-six billion, twenty-one million, one hundred sixty-four thousand, four hundred forty-three".