145605146221 has 4 divisors (see below), whose sum is σ = 146893687452. Its totient is φ = 144316604992.

The previous prime is 145605146131. The next prime is 145605146237. The reversal of 145605146221 is 122641506541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122641506541 = 57773 ⋅2122817.

It can be written as a sum of positive squares in 2 ways, for example, as 58813040196 + 86792106025 = 242514^2 + 294605^2 .

It is a cyclic number.

It is not a de Polignac number, because 145605146221 - 2⁹ = 145605145709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145605146261) 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, 644270446 + ... + 644270671.

It is an arithmetic number, because the mean of its divisors is an integer number (36723421863).

Almost surely, 2^145605146221 is an apocalyptic number.

It is an amenable number.

145605146221 is a deficient number, since it is larger than the sum of its proper divisors (1288541231).

145605146221 is a wasteful number, since it uses less digits than its factorization.

145605146221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288541230.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 145605146221 in words is "one hundred forty-five billion, six hundred five million, one hundred forty-six thousand, two hundred twenty-one".