145215321505 has 4 divisors (see below), whose sum is σ = 174258385812. Its totient is φ = 116172257200.

The previous prime is 145215321473. The next prime is 145215321547. The reversal of 145215321505 is 505123512541.

145215321505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61957681569 + 83257639936 = 248913^2 + 288544^2 .

It is not a de Polignac number, because 145215321505 - 2⁵ = 145215321473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 14521532146 + ... + 14521532155.

It is an arithmetic number, because the mean of its divisors is an integer number (43564596453).

Almost surely, 2^145215321505 is an apocalyptic number.

It is an amenable number.

145215321505 is a deficient number, since it is larger than the sum of its proper divisors (29043064307).

145215321505 is an equidigital number, since it uses as much as digits as its factorization.

145215321505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29043064306.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 145215321505 in words is "one hundred forty-five billion, two hundred fifteen million, three hundred twenty-one thousand, five hundred five".