1520749461649 has 8 divisors (see below), whose sum is σ = 1672710153120. Its totient is φ = 1382499509380.

The previous prime is 1520749461629. The next prime is 1520749461659. The reversal of 1520749461649 is 9461649470251.

It is a happy number.

It is not a de Polignac number, because 1520749461649 - 2¹¹ = 1520749459601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1520749461593 and 1520749461602.

It is not an unprimeable number, because it can be changed into a prime (1520749461629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571279459 + ... + 571282120.

It is an arithmetic number, because the mean of its divisors is an integer number (209088769140).

Almost surely, 2^{1520749461649} is an apocalyptic number.

It is an amenable number.

1520749461649 is a deficient number, since it is larger than the sum of its proper divisors (151960691471).

1520749461649 is an equidigital number, since it uses as much as digits as its factorization.

1520749461649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142561612 (or 1142561590 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 1520749461649 in words is "one trillion, five hundred twenty billion, seven hundred forty-nine million, four hundred sixty-one thousand, six hundred forty-nine".