145473220237 has 4 divisors (see below), whose sum is σ = 151798142880. Its totient is φ = 139148297596.

The previous prime is 145473220201. The next prime is 145473220271. The reversal of 145473220237 is 732022374541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 732022374541 = 32377 ⋅22609333.

It is a cyclic number.

It is not a de Polignac number, because 145473220237 - 2²⁷ = 145339002509 is a prime.

It is a super-2 number, since 2×145473220237² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145473220237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145473220537) 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, 3162461287 + ... + 3162461332.

It is an arithmetic number, because the mean of its divisors is an integer number (37949535720).

Almost surely, 2^145473220237 is an apocalyptic number.

It is an amenable number.

145473220237 is a deficient number, since it is larger than the sum of its proper divisors (6324922643).

145473220237 is an equidigital number, since it uses as much as digits as its factorization.

145473220237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324922642.

The product of its (nonzero) digits is 282240, while the sum is 40.

Adding to 145473220237 its reverse (732022374541), we get a palindrome (877495594778).

The spelling of 145473220237 in words is "one hundred forty-five billion, four hundred seventy-three million, two hundred twenty thousand, two hundred thirty-seven".