245721165 has 16 divisors (see below), whose sum is σ = 394153728. Its totient is φ = 130718016.

The previous prime is 245721149. The next prime is 245721169. The reversal of 245721165 is 561127542.

245721165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 245721165 - 2⁴ = 245721149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245721169) 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, 14677 + ... + 26586.

It is an arithmetic number, because the mean of its divisors is an integer number (24634608).

Almost surely, 2^245721165 is an apocalyptic number.

It is an amenable number.

245721165 is a deficient number, since it is larger than the sum of its proper divisors (148432563).

245721165 is a wasteful number, since it uses less digits than its factorization.

245721165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41668.

The product of its digits is 16800, while the sum is 33.

The square root of 245721165 is about 15675.4956859424. The cubic root of 245721165 is about 626.3458273844.

The spelling of 245721165 in words is "two hundred forty-five million, seven hundred twenty-one thousand, one hundred sixty-five".