245321661 has 16 divisors (see below), whose sum is σ = 352537920. Its totient is φ = 150846720.

The previous prime is 245321641. The next prime is 245321669. The reversal of 245321661 is 166123542.

It is not a de Polignac number, because 245321661 - 2¹⁹ = 244797373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245321669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92725 + ... + 95333.

It is an arithmetic number, because the mean of its divisors is an integer number (22033620).

Almost surely, 2^245321661 is an apocalyptic number.

It is an amenable number.

245321661 is a deficient number, since it is larger than the sum of its proper divisors (107216259).

245321661 is a wasteful number, since it uses less digits than its factorization.

245321661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5036.

The product of its digits is 8640, while the sum is 30.

The square root of 245321661 is about 15662.7475559047. The cubic root of 245321661 is about 626.0061966267.

The spelling of 245321661 in words is "two hundred forty-five million, three hundred twenty-one thousand, six hundred sixty-one".