1345605045521 has 16 divisors (see below), whose sum is σ = 1507699488768. Its totient is φ = 1190142460800.

The previous prime is 1345605045509. The next prime is 1345605045557. The reversal of 1345605045521 is 1255405065431.

It is a cyclic number.

It is not a de Polignac number, because 1345605045521 - 2⁶ = 1345605045457 is a prime.

It is a super-2 number, since 2×1345605045521² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1345605045121) 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 15 ways as a sum of consecutive naturals, for example, 7148021 + ... + 7333853.

It is an arithmetic number, because the mean of its divisors is an integer number (94231218048).

Almost surely, 2^{1345605045521} is an apocalyptic number.

1345605045521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1345605045521 is a deficient number, since it is larger than the sum of its proper divisors (162094443247).

1345605045521 is a wasteful number, since it uses less digits than its factorization.

1345605045521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203672.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 1345605045521 in words is "one trillion, three hundred forty-five billion, six hundred five million, forty-five thousand, five hundred twenty-one".