1755561378122 has 4 divisors (see below), whose sum is σ = 2633342067186. Its totient is φ = 877780689060.

The previous prime is 1755561378121. The next prime is 1755561378211. The reversal of 1755561378122 is 2218731655571.

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 only one way, i.e., 1642188427441 + 113372950681 = 1281479^2 + 336709^2 .

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 as a sum of consecutive naturals, namely, 438890344529 + ... + 438890344532.

Almost surely, 2^{1755561378122} is an apocalyptic number.

1755561378122 is a deficient number, since it is larger than the sum of its proper divisors (877780689064).

1755561378122 is an equidigital number, since it uses as much as digits as its factorization.

1755561378122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877780689063.

The product of its digits is 3528000, while the sum is 53.

The spelling of 1755561378122 in words is "one trillion, seven hundred fifty-five billion, five hundred sixty-one million, three hundred seventy-eight thousand, one hundred twenty-two".