1520686172145 has 16 divisors (see below), whose sum is σ = 2780683286400. Its totient is φ = 695170821504.

The previous prime is 1520686172069. The next prime is 1520686172147. The reversal of 1520686172145 is 5412716860251.

It is a happy number.

It is not a de Polignac number, because 1520686172145 - 2¹⁶ = 1520686106609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1520686172094 and 1520686172103.

It is not an unprimeable number, because it can be changed into a prime (1520686172147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7241362620 + ... + 7241362829.

It is an arithmetic number, because the mean of its divisors is an integer number (173792705400).

Almost surely, 2^{1520686172145} is an apocalyptic number.

1520686172145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1520686172145 is a deficient number, since it is larger than the sum of its proper divisors (1259997114255).

1520686172145 is a wasteful number, since it uses less digits than its factorization.

1520686172145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14482725464.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 1520686172145 in words is "one trillion, five hundred twenty billion, six hundred eighty-six million, one hundred seventy-two thousand, one hundred forty-five".