202123543045 has 4 divisors (see below), whose sum is σ = 242548251660. Its totient is φ = 161698834432.

The previous prime is 202123543031. The next prime is 202123543067. The reversal of 202123543045 is 540345321202.

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 51033520836 + 151090022209 = 225906^2 + 388703^2 .

It is a cyclic number.

It is not a de Polignac number, because 202123543045 - 2³⁷ = 64684589573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202123542998 and 202123543016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20212354300 + ... + 20212354309.

It is an arithmetic number, because the mean of its divisors is an integer number (60637062915).

Almost surely, 2^202123543045 is an apocalyptic number.

It is an amenable number.

202123543045 is a deficient number, since it is larger than the sum of its proper divisors (40424708615).

202123543045 is an equidigital number, since it uses as much as digits as its factorization.

202123543045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40424708614.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 202123543045 its reverse (540345321202), we get a palindrome (742468864247).

The spelling of 202123543045 in words is "two hundred two billion, one hundred twenty-three million, five hundred forty-three thousand, forty-five".