1755561378123 has 36 divisors (see below), whose sum is σ = 2979027041328. Its totient is φ = 993245450400.

The previous prime is 1755561378121. The next prime is 1755561378211. The reversal of 1755561378123 is 3218731655571.

1755561378123 is a `hidden beast` number, since 1 + 7 + 5 + 5 + 5 + 613 + 7 + 8 + 12 + 3 = 666.

It is not a de Polignac number, because 1755561378123 - 2¹ = 1755561378121 is a prime.

It is a super-3 number, since 3×1755561378123³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1755561378123.

It is not an unprimeable number, because it can be changed into a prime (1755561378121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19662711 + ... + 19751792.

It is an arithmetic number, because the mean of its divisors is an integer number (82750751148).

Almost surely, 2^{1755561378123} is an apocalyptic number.

1755561378123 is a deficient number, since it is larger than the sum of its proper divisors (1223465663205).

1755561378123 is a wasteful number, since it uses less digits than its factorization.

1755561378123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39414624 (or 39414614 counting only the distinct ones).

The product of its digits is 5292000, while the sum is 54.

The spelling of 1755561378123 in words is "one trillion, seven hundred fifty-five billion, five hundred sixty-one million, three hundred seventy-eight thousand, one hundred twenty-three".