245743661 has 16 divisors (see below), whose sum is σ = 262120320. Its totient is φ = 229901760.

The previous prime is 245743649. The next prime is 245743679. The reversal of 245743661 is 166347542.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 245743661 - 2¹⁴ = 245727277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245743601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207491 + ... + 208671.

It is an arithmetic number, because the mean of its divisors is an integer number (16382520).

Almost surely, 2^245743661 is an apocalyptic number.

It is an amenable number.

245743661 is a deficient number, since it is larger than the sum of its proper divisors (16376659).

245743661 is a wasteful number, since it uses less digits than its factorization.

245743661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396.

The product of its digits is 120960, while the sum is 38.

The square root of 245743661 is about 15676.2132225866. The cubic root of 245743661 is about 626.3649409811.

The spelling of 245743661 in words is "two hundred forty-five million, seven hundred forty-three thousand, six hundred sixty-one".