1523156820813 has 12 divisors (see below), whose sum is σ = 2219585457180. Its totient is φ = 1006451703936.

The previous prime is 1523156820811. The next prime is 1523156820839. The reversal of 1523156820813 is 3180286513251.

1523156820813 is a `hidden beast` number, since 1 + 5 + 2 + 3 + 1 + 568 + 2 + 0 + 81 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 133618029444 + 1389538791369 = 365538^2 + 1178787^2 .

It is not a de Polignac number, because 1523156820813 - 2¹ = 1523156820811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1523156820811) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 748846978 + ... + 748849011.

It is an arithmetic number, because the mean of its divisors is an integer number (184965454765).

Almost surely, 2^{1523156820813} is an apocalyptic number.

It is an amenable number.

1523156820813 is a deficient number, since it is larger than the sum of its proper divisors (696428636367).

1523156820813 is a wasteful number, since it uses less digits than its factorization.

1523156820813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497696108 (or 1497696105 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 1523156820813 in words is "one trillion, five hundred twenty-three billion, one hundred fifty-six million, eight hundred twenty thousand, eight hundred thirteen".