42520120245 has 12 divisors (see below), whose sum is σ = 73701541836. Its totient is φ = 22677397440.

The previous prime is 42520120241. The next prime is 42520120271. The reversal of 42520120245 is 54202102524.

It can be written as a sum of positive squares in 2 ways, for example, as 18732301956 + 23787818289 = 136866^2 + 154233^2 .

It is not a de Polignac number, because 42520120245 - 2² = 42520120241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42520120241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472445736 + ... + 472445825.

It is an arithmetic number, because the mean of its divisors is an integer number (6141795153).

Almost surely, 2^42520120245 is an apocalyptic number.

42520120245 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42520120245 is a deficient number, since it is larger than the sum of its proper divisors (31181421591).

42520120245 is a wasteful number, since it uses less digits than its factorization.

42520120245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944891572 (or 944891569 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 42520120245 its reverse (54202102524), we get a palindrome (96722222769).

The spelling of 42520120245 in words is "forty-two billion, five hundred twenty million, one hundred twenty thousand, two hundred forty-five".