1425550243521 has 16 divisors (see below), whose sum is σ = 1966593015360. Its totient is φ = 917447711040.

The previous prime is 1425550243519. The next prime is 1425550243561. The reversal of 1425550243521 is 1253420555241.

It is not a de Polignac number, because 1425550243521 - 2¹ = 1425550243519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1425550243521.

It is not an unprimeable number, because it can be changed into a prime (1425550243561) 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, 775735 + ... + 1858188.

It is an arithmetic number, because the mean of its divisors is an integer number (122912063460).

Almost surely, 2^{1425550243521} is an apocalyptic number.

It is an amenable number.

1425550243521 is a deficient number, since it is larger than the sum of its proper divisors (541042771839).

1425550243521 is a wasteful number, since it uses less digits than its factorization.

1425550243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640176.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 1425550243521 its reverse (1253420555241), we get a palindrome (2678970798762).

The spelling of 1425550243521 in words is "one trillion, four hundred twenty-five billion, five hundred fifty million, two hundred forty-three thousand, five hundred twenty-one".