245661983449 has 9 divisors (see below), whose sum is σ = 246375294687. Its totient is φ = 244950735744.

The previous prime is 245661983443. The next prime is 245661983459. The reversal of 245661983449 is 944389166542.

The square root of 245661983449 is 495643.

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., 243961905625 + 1700077824 = 493925^2 + 41232^2 .

It is a de Polignac number, because none of the positive numbers 2^k-245661983449 is a prime.

It is a super-2 number, since 2×245661983449² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245661983443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 285985582 + ... + 285986440.

It is an arithmetic number, because the mean of its divisors is an integer number (27375032743).

Almost surely, 2^245661983449 is an apocalyptic number.

245661983449 is the 495643-rd square number.

245661983449 is the 247822-nd centered octagonal number.

It is an amenable number.

245661983449 is a deficient number, since it is larger than the sum of its proper divisors (713311238).

245661983449 is an frugal number, since it uses more digits than its factorization.

245661983449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 1436 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 61.

The spelling of 245661983449 in words is "two hundred forty-five billion, six hundred sixty-one million, nine hundred eighty-three thousand, four hundred forty-nine".