1313564121555 has 32 divisors (see below), whose sum is σ = 2466863284224. Its totient is φ = 584257090176.

The previous prime is 1313564121539. The next prime is 1313564121613. The reversal of 1313564121555 is 5551214653131.

It is not a de Polignac number, because 1313564121555 - 2⁴ = 1313564121539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169051987 + ... + 169059756.

It is an arithmetic number, because the mean of its divisors is an integer number (77089477632).

Almost surely, 2^{1313564121555} is an apocalyptic number.

1313564121555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1313564121555 is a deficient number, since it is larger than the sum of its proper divisors (1153299162669).

1313564121555 is a wasteful number, since it uses less digits than its factorization.

1313564121555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338111795.

The product of its digits is 270000, while the sum is 42.

Adding to 1313564121555 its reverse (5551214653131), we get a palindrome (6864778774686).

The spelling of 1313564121555 in words is "one trillion, three hundred thirteen billion, five hundred sixty-four million, one hundred twenty-one thousand, five hundred fifty-five".