145220214505 has 4 divisors (see below), whose sum is σ = 174264257412. Its totient is φ = 116176171600.

The previous prime is 145220214493. The next prime is 145220214509. The reversal of 145220214505 is 505412022541.

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 88429511641 + 56790702864 = 297371^2 + 238308^2 .

It is not a de Polignac number, because 145220214505 - 2²³ = 145211825897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145220214509) 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, 14522021446 + ... + 14522021455.

It is an arithmetic number, because the mean of its divisors is an integer number (43566064353).

Almost surely, 2^145220214505 is an apocalyptic number.

It is an amenable number.

145220214505 is a deficient number, since it is larger than the sum of its proper divisors (29044042907).

145220214505 is an equidigital number, since it uses as much as digits as its factorization.

145220214505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29044042906.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 145220214505 in words is "one hundred forty-five billion, two hundred twenty million, two hundred fourteen thousand, five hundred five".