2545554431521 has 4 divisors (see below), whose sum is σ = 2548517825200. Its totient is φ = 2542591037844.

The previous prime is 2545554431501. The next prime is 2545554431587. The reversal of 2545554431521 is 1251344555452.

It is a happy number.

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 2545554431521 - 2⁷ = 2545554431393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2545554431501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1481695551 + ... + 1481697268.

It is an arithmetic number, because the mean of its divisors is an integer number (637129456300).

Almost surely, 2^{2545554431521} is an apocalyptic number.

It is an amenable number.

2545554431521 is a deficient number, since it is larger than the sum of its proper divisors (2963393679).

2545554431521 is an equidigital number, since it uses as much as digits as its factorization.

2545554431521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963393678.

The product of its digits is 2400000, while the sum is 46.

Adding to 2545554431521 its reverse (1251344555452), we get a palindrome (3796898986973).

The spelling of 2545554431521 in words is "two trillion, five hundred forty-five billion, five hundred fifty-four million, four hundred thirty-one thousand, five hundred twenty-one".