1553511544121 has 8 divisors (see below), whose sum is σ = 1571225702400. Its totient is φ = 1535803140960.

The previous prime is 1553511544043. The next prime is 1553511544129. The reversal of 1553511544121 is 1214451153551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1553511544121 - 2²² = 1553507349817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553511544129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894665 + ... + 1976726.

It is an arithmetic number, because the mean of its divisors is an integer number (196403212800).

Almost surely, 2^{1553511544121} is an apocalyptic number.

It is an amenable number.

1553511544121 is a deficient number, since it is larger than the sum of its proper divisors (17714158279).

1553511544121 is an equidigital number, since it uses as much as digits as its factorization.

1553511544121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877559.

The product of its digits is 60000, while the sum is 38.

Adding to 1553511544121 its reverse (1214451153551), we get a palindrome (2767962697672).

The spelling of 1553511544121 in words is "one trillion, five hundred fifty-three billion, five hundred eleven million, five hundred forty-four thousand, one hundred twenty-one".