1520505255145 has 4 divisors (see below), whose sum is σ = 1824606306180. Its totient is φ = 1216404204112.

The previous prime is 1520505255131. The next prime is 1520505255161. The reversal of 1520505255145 is 5415525050251.

It is a happy number.

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 259728852496 + 1260776402649 = 509636^2 + 1122843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520505255145 - 2¹¹ = 1520505253097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1520505255098 and 1520505255107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152050525510 + ... + 152050525519.

It is an arithmetic number, because the mean of its divisors is an integer number (456151576545).

Almost surely, 2^{1520505255145} is an apocalyptic number.

It is an amenable number.

1520505255145 is a deficient number, since it is larger than the sum of its proper divisors (304101051035).

1520505255145 is an equidigital number, since it uses as much as digits as its factorization.

1520505255145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304101051034.

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 1520505255145 in words is "one trillion, five hundred twenty billion, five hundred five million, two hundred fifty-five thousand, one hundred forty-five".