1221958164463 has 2 divisors, whose sum is σ = 1221958164464. Its totient is φ = 1221958164462.

The previous prime is 1221958164461. The next prime is 1221958164503. The reversal of 1221958164463 is 3644618591221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221958164463 - 2¹ = 1221958164461 is a prime.

Together with 1221958164461, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221958164463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221958164461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610979082231 + 610979082232.

It is an arithmetic number, because the mean of its divisors is an integer number (610979082232).

Almost surely, 2^{1221958164463} is an apocalyptic number.

1221958164463 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221958164463 is an equidigital number, since it uses as much as digits as its factorization.

1221958164463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 52.

The spelling of 1221958164463 in words is "one trillion, two hundred twenty-one billion, nine hundred fifty-eight million, one hundred sixty-four thousand, four hundred sixty-three".