1521612020545 has 8 divisors (see below), whose sum is σ = 1860386017896. Its totient is φ = 1194321887616.

The previous prime is 1521612020543. The next prime is 1521612020561. The reversal of 1521612020545 is 5450202161251.

It can be written as a sum of positive squares in 4 ways, for example, as 565720596736 + 955891423809 = 752144^2 + 977697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521612020545 - 2¹ = 1521612020543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1521612020545.

It is not an unprimeable number, because it can be changed into a prime (1521612020543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2870965812 + ... + 2870966341.

It is an arithmetic number, because the mean of its divisors is an integer number (232548252237).

Almost surely, 2^{1521612020545} is an apocalyptic number.

It is an amenable number.

1521612020545 is a deficient number, since it is larger than the sum of its proper divisors (338773997351).

1521612020545 is an equidigital number, since it uses as much as digits as its factorization.

1521612020545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5741932211.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 1521612020545 its reverse (5450202161251), we get a palindrome (6971814181796).

The spelling of 1521612020545 in words is "one trillion, five hundred twenty-one billion, six hundred twelve million, twenty thousand, five hundred forty-five".