145221145244515 has 4 divisors (see below), whose sum is σ = 174265374293424. Its totient is φ = 116176916195608.

The previous prime is 145221145244501. The next prime is 145221145244519. The reversal of 145221145244515 is 515442541122541.

145221145244515 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 is a cyclic number.

It is not a de Polignac number, because 145221145244515 - 2³⁹ = 144671389430627 is a prime.

It is a super-2 number, since 2×145221145244515² (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 (145221145244519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14522114524447 + ... + 14522114524456.

It is an arithmetic number, because the mean of its divisors is an integer number (43566343573356).

Almost surely, 2^{145221145244515} is an apocalyptic number.

145221145244515 is a deficient number, since it is larger than the sum of its proper divisors (29044229048909).

145221145244515 is an equidigital number, since it uses as much as digits as its factorization.

145221145244515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29044229048908.

The product of its digits is 1280000, while the sum is 46.

The spelling of 145221145244515 in words is "one hundred forty-five trillion, two hundred twenty-one billion, one hundred forty-five million, two hundred forty-four thousand, five hundred fifteen".