1551525420553 has 4 divisors (see below), whose sum is σ = 1642791621780. Its totient is φ = 1460259219328.

The previous prime is 1551525420539. The next prime is 1551525420637. The reversal of 1551525420553 is 3550245251551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1367795742784 + 183729677769 = 1169528^2 + 428637^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551525420553 - 2³⁷ = 1414086467081 is a prime.

It is a super-2 number, since 2×1551525420553² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551525420253) 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, 45633100588 + ... + 45633100621.

It is an arithmetic number, because the mean of its divisors is an integer number (410697905445).

Almost surely, 2^{1551525420553} is an apocalyptic number.

It is an amenable number.

1551525420553 is a deficient number, since it is larger than the sum of its proper divisors (91266201227).

1551525420553 is an equidigital number, since it uses as much as digits as its factorization.

1551525420553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91266201226.

The product of its (nonzero) digits is 750000, while the sum is 43.

The spelling of 1551525420553 in words is "one trillion, five hundred fifty-one billion, five hundred twenty-five million, four hundred twenty thousand, five hundred fifty-three".