245220431243551 has 4 divisors (see below), whose sum is σ = 245223514654504. Its totient is φ = 245217347832600.

The previous prime is 245220431243549. The next prime is 245220431243653. The reversal of 245220431243551 is 155342134022542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245220431243551 - 2¹ = 245220431243549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245220431243498 and 245220431243507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245220431247551) 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, 1541586180 + ... + 1541745241.

It is an arithmetic number, because the mean of its divisors is an integer number (61305878663626).

Almost surely, 2^{245220431243551} is an apocalyptic number.

245220431243551 is a deficient number, since it is larger than the sum of its proper divisors (3083410953).

245220431243551 is an equidigital number, since it uses as much as digits as its factorization.

245220431243551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083410952.

The product of its (nonzero) digits is 1152000, while the sum is 43.

The spelling of 245220431243551 in words is "two hundred forty-five trillion, two hundred twenty billion, four hundred thirty-one million, two hundred forty-three thousand, five hundred fifty-one".