1223513454545 has 4 divisors (see below), whose sum is σ = 1468216145460. Its totient is φ = 978810763632.

The previous prime is 1223513454529. The next prime is 1223513454589. The reversal of 1223513454545 is 5454543153221.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 964420238401 + 259093216144 = 982049^2 + 509012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223513454545 - 2⁴ = 1223513454529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223513454496 and 1223513454505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122351345450 + ... + 122351345459.

It is an arithmetic number, because the mean of its divisors is an integer number (367054036365).

Almost surely, 2^{1223513454545} is an apocalyptic number.

It is an amenable number.

1223513454545 is a deficient number, since it is larger than the sum of its proper divisors (244702690915).

1223513454545 is an equidigital number, since it uses as much as digits as its factorization.

1223513454545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244702690914.

The product of its digits is 1440000, while the sum is 44.

The spelling of 1223513454545 in words is "one trillion, two hundred twenty-three billion, five hundred thirteen million, four hundred fifty-four thousand, five hundred forty-five".