1543661120745 has 24 divisors (see below), whose sum is σ = 2676363723072. Its totient is φ = 823075332000.

The previous prime is 1543661120707. The next prime is 1543661120753. The reversal of 1543661120745 is 5470211663451.

It is a happy number.

1543661120745 is a `hidden beast` number, since 1 + 5 + 4 + 3 + 6 + 611 + 20 + 7 + 4 + 5 = 666.

It is not a de Polignac number, because 1543661120745 - 2¹⁸ = 1543660858601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1543661120745.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4209531 + ... + 4561520.

It is an arithmetic number, because the mean of its divisors is an integer number (111515155128).

Almost surely, 2^{1543661120745} is an apocalyptic number.

1543661120745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1543661120745 is a deficient number, since it is larger than the sum of its proper divisors (1132702602327).

1543661120745 is a wasteful number, since it uses less digits than its factorization.

1543661120745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8774973 (or 8774970 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 1543661120745 in words is "one trillion, five hundred forty-three billion, six hundred sixty-one million, one hundred twenty thousand, seven hundred forty-five".