1221733566463 has 4 divisors (see below), whose sum is σ = 1221873026608. Its totient is φ = 1221594106320.

The previous prime is 1221733566457. The next prime is 1221733566481. The reversal of 1221733566463 is 3646653371221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221733566463 - 2²⁵ = 1221700012031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221733566433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69716931 + ... + 69734452.

It is an arithmetic number, because the mean of its divisors is an integer number (305468256652).

Almost surely, 2^{1221733566463} is an apocalyptic number.

1221733566463 is a deficient number, since it is larger than the sum of its proper divisors (139460145).

1221733566463 is an equidigital number, since it uses as much as digits as its factorization.

1221733566463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139460144.

The product of its digits is 3265920, while the sum is 49.

The spelling of 1221733566463 in words is "one trillion, two hundred twenty-one billion, seven hundred thirty-three million, five hundred sixty-six thousand, four hundred sixty-three".