12538779653570 has 16 divisors (see below), whose sum is σ = 22588409996280. Its totient is φ = 5011377057024.

The previous prime is 12538779653557. The next prime is 12538779653581. The reversal of 12538779653570 is 7535697783521.

12538779653570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2583095054401 + 9955684599169 = 1607201^2 + 3155263^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12538779653570.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516837815 + ... + 516862074.

Almost surely, 2^{12538779653570} is an apocalyptic number.

12538779653570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12538779653570 is a deficient number, since it is larger than the sum of its proper divisors (10049630342710).

12538779653570 is a wasteful number, since it uses less digits than its factorization.

12538779653570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033701109.

The product of its (nonzero) digits is 333396000, while the sum is 68.

The spelling of 12538779653570 in words is "twelve trillion, five hundred thirty-eight billion, seven hundred seventy-nine million, six hundred fifty-three thousand, five hundred seventy".