1203661103545 has 16 divisors (see below), whose sum is σ = 1446202170000. Its totient is φ = 961723542528.

The previous prime is 1203661103459. The next prime is 1203661103563. The reversal of 1203661103545 is 5453011663021.

It can be written as a sum of positive squares in 8 ways, for example, as 115021365904 + 1088639737641 = 339148^2 + 1043379^2 .

It is a cyclic number.

It is not a de Polignac number, because 1203661103545 - 2¹¹ = 1203661101497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18477091 + ... + 18542119.

It is an arithmetic number, because the mean of its divisors is an integer number (90387635625).

Almost surely, 2^{1203661103545} is an apocalyptic number.

It is an amenable number.

1203661103545 is a deficient number, since it is larger than the sum of its proper divisors (242541066455).

1203661103545 is a wasteful number, since it uses less digits than its factorization.

1203661103545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69612.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 1203661103545 its reverse (5453011663021), we get a palindrome (6656672766566).

The spelling of 1203661103545 in words is "one trillion, two hundred three billion, six hundred sixty-one million, one hundred three thousand, five hundred forty-five".