245209699043929 has 27 divisors (see below), whose sum is σ = 262736341545951. Its totient is φ = 228818099545200.

The previous prime is 245209699043867. The next prime is 245209699043989. The reversal of 245209699043929 is 929340996902542.

The square root of 245209699043929 is 15659173.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 86381651753929 + 158828047290000 = 9294173^2 + 12602700^2 .

It is not a de Polignac number, because 245209699043929 - 2⁹ = 245209699043417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245209699043989) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19934121079 + ... + 19934133379.

It is an arithmetic number, because the mean of its divisors is an integer number (9730975612813).

Almost surely, 2^{245209699043929} is an apocalyptic number.

245209699043929 is the 15659173-rd square number.

245209699043929 is the 7829587-th centered octagonal number.

It is an amenable number.

245209699043929 is a deficient number, since it is larger than the sum of its proper divisors (17526642502022).

245209699043929 is an frugal number, since it uses more digits than its factorization.

245209699043929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24774 (or 12387 counting only the distinct ones).

The product of its (nonzero) digits is 680244480, while the sum is 73.

The spelling of 245209699043929 in words is "two hundred forty-five trillion, two hundred nine billion, six hundred ninety-nine million, forty-three thousand, nine hundred twenty-nine".