1243505422545 has 16 divisors (see below), whose sum is σ = 1996950412032. Its totient is φ = 660755646720.

The previous prime is 1243505422543. The next prime is 1243505422589. The reversal of 1243505422545 is 5452245053421.

It is not a de Polignac number, because 1243505422545 - 2¹ = 1243505422543 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243505422497 and 1243505422506.

It is not an unprimeable number, because it can be changed into a prime (1243505422543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152948632 + ... + 152956761.

It is an arithmetic number, because the mean of its divisors is an integer number (124809400752).

Almost surely, 2^{1243505422545} is an apocalyptic number.

1243505422545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243505422545 is a deficient number, since it is larger than the sum of its proper divisors (753444989487).

1243505422545 is a wasteful number, since it uses less digits than its factorization.

1243505422545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305905672.

The product of its (nonzero) digits is 960000, while the sum is 42.

The spelling of 1243505422545 in words is "one trillion, two hundred forty-three billion, five hundred five million, four hundred twenty-two thousand, five hundred forty-five".