1345253220520 has 128 divisors (see below), whose sum is σ = 3479103705600. Its totient is φ = 462992544000.

The previous prime is 1345253220491. The next prime is 1345253220527. The reversal of 1345253220520 is 250223525431.

It is not an unprimeable number, because it can be changed into a prime (1345253220527) 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 31 ways as a sum of consecutive naturals, for example, 8709807 + ... + 8862913.

It is an arithmetic number, because the mean of its divisors is an integer number (27180497700).

Almost surely, 2^{1345253220520} is an apocalyptic number.

1345253220520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1345253220520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1739551852800).

1345253220520 is an abundant number, since it is smaller than the sum of its proper divisors (2133850485080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1345253220520 is a wasteful number, since it uses less digits than its factorization.

1345253220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154199 (or 154195 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 1345253220520 its reverse (250223525431), we get a palindrome (1595476745951).

The spelling of 1345253220520 in words is "one trillion, three hundred forty-five billion, two hundred fifty-three million, two hundred twenty thousand, five hundred twenty".