1345255165521 has 24 divisors (see below), whose sum is σ = 1967859703680. Its totient is φ = 885431959776.

The previous prime is 1345255165453. The next prime is 1345255165547. The reversal of 1345255165521 is 1255615525431.

1345255165521 is a `hidden beast` number, since 1 + 3 + 4 + 525 + 51 + 6 + 55 + 21 = 666.

It is not a de Polignac number, because 1345255165521 - 2³¹ = 1343107681873 is a prime.

It is a super-2 number, since 2×1345255165521² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1345255165571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14676991 + ... + 14768363.

It is an arithmetic number, because the mean of its divisors is an integer number (81994154320).

Almost surely, 2^{1345255165521} is an apocalyptic number.

It is an amenable number.

1345255165521 is a deficient number, since it is larger than the sum of its proper divisors (622604538159).

1345255165521 is a wasteful number, since it uses less digits than its factorization.

1345255165521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112165 (or 112162 counting only the distinct ones).

The product of its digits is 900000, while the sum is 45.

The spelling of 1345255165521 in words is "one trillion, three hundred forty-five billion, two hundred fifty-five million, one hundred sixty-five thousand, five hundred twenty-one".