1955761827121 has 4 divisors (see below), whose sum is σ = 1959681190000. Its totient is φ = 1951842464244.

The previous prime is 1955761827067. The next prime is 1955761827181. The reversal of 1955761827121 is 1217281675591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1955761827121 - 2⁹ = 1955761826609 is a prime.

It is a super-2 number, since 2×1955761827121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1955761827181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959680691 + ... + 1959681688.

It is an arithmetic number, because the mean of its divisors is an integer number (489920297500).

Almost surely, 2^{1955761827121} is an apocalyptic number.

It is an amenable number.

1955761827121 is a deficient number, since it is larger than the sum of its proper divisors (3919362879).

1955761827121 is an equidigital number, since it uses as much as digits as its factorization.

1955761827121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919362878.

The product of its digits is 2116800, while the sum is 55.

The spelling of 1955761827121 in words is "one trillion, nine hundred fifty-five billion, seven hundred sixty-one million, eight hundred twenty-seven thousand, one hundred twenty-one".