1213564102553 has 6 divisors (see below), whose sum is σ = 1333917567402. Its totient is φ = 1103240093120.

The previous prime is 1213564102537. The next prime is 1213564102571. The reversal of 1213564102553 is 3552014653121.

It can be written as a sum of positive squares in only one way, i.e., 1013994622729 + 199569479824 = 1006973^2 + 446732^2 .

It is not a de Polignac number, because 1213564102553 - 2⁴ = 1213564102537 is a prime.

It is a super-2 number, since 2×1213564102553² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213564102523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5014727576 + ... + 5014727817.

It is an arithmetic number, because the mean of its divisors is an integer number (222319594567).

Almost surely, 2^{1213564102553} is an apocalyptic number.

It is an amenable number.

1213564102553 is a deficient number, since it is larger than the sum of its proper divisors (120353464849).

1213564102553 is a wasteful number, since it uses less digits than its factorization.

1213564102553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10029455415 (or 10029455404 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 1213564102553 its reverse (3552014653121), we get a palindrome (4765578755674).

The spelling of 1213564102553 in words is "one trillion, two hundred thirteen billion, five hundred sixty-four million, one hundred two thousand, five hundred fifty-three".