1251504545455 has 4 divisors (see below), whose sum is σ = 1501805454552. Its totient is φ = 1001203636360.

The previous prime is 1251504545449. The next prime is 1251504545471. The reversal of 1251504545455 is 5545454051521.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1251504545455 is a prime.

It is a super-2 number, since 2×1251504545455² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125150454541 + ... + 125150454550.

It is an arithmetic number, because the mean of its divisors is an integer number (375451363638).

Almost surely, 2^{1251504545455} is an apocalyptic number.

1251504545455 is a deficient number, since it is larger than the sum of its proper divisors (250300909097).

1251504545455 is an equidigital number, since it uses as much as digits as its factorization.

1251504545455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250300909096.

The product of its (nonzero) digits is 2000000, while the sum is 46.

Adding to 1251504545455 its reverse (5545454051521), we get a palindrome (6796958596976).

The spelling of 1251504545455 in words is "one trillion, two hundred fifty-one billion, five hundred four million, five hundred forty-five thousand, four hundred fifty-five".