145343353121521 has 4 divisors (see below), whose sum is σ = 148435764890112. Its totient is φ = 142250941352932.

The previous prime is 145343353121419. The next prime is 145343353121573. The reversal of 145343353121521 is 125121353343541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145343353121521 - 2¹⁷ = 145343352990449 is a prime.

It is a super-2 number, since 2×145343353121521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145343353121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546205884225 + ... + 1546205884318.

It is an arithmetic number, because the mean of its divisors is an integer number (37108941222528).

Almost surely, 2^{145343353121521} is an apocalyptic number.

It is an amenable number.

145343353121521 is a deficient number, since it is larger than the sum of its proper divisors (3092411768591).

145343353121521 is an equidigital number, since it uses as much as digits as its factorization.

145343353121521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092411768590.

The product of its digits is 648000, while the sum is 43.

The spelling of 145343353121521 in words is "one hundred forty-five trillion, three hundred forty-three billion, three hundred fifty-three million, one hundred twenty-one thousand, five hundred twenty-one".