1425631321555 has 16 divisors (see below), whose sum is σ = 1955984682240. Its totient is φ = 977159185632.

The previous prime is 1425631321529. The next prime is 1425631321559. The reversal of 1425631321555 is 5551231365241.

It is not a de Polignac number, because 1425631321555 - 2¹¹ = 1425631319507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1425631321559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8595385 + ... + 8759674.

It is an arithmetic number, because the mean of its divisors is an integer number (122249042640).

Almost surely, 2^{1425631321555} is an apocalyptic number.

1425631321555 is a deficient number, since it is larger than the sum of its proper divisors (530353360685).

1425631321555 is a wasteful number, since it uses less digits than its factorization.

1425631321555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17357418.

The product of its digits is 540000, while the sum is 43.

Adding to 1425631321555 its reverse (5551231365241), we get a palindrome (6976862686796).

The spelling of 1425631321555 in words is "one trillion, four hundred twenty-five billion, six hundred thirty-one million, three hundred twenty-one thousand, five hundred fifty-five".