245721591811 has 16 divisors (see below), whose sum is σ = 268193773440. Its totient is φ = 224186434560.

The previous prime is 245721591761. The next prime is 245721591827. The reversal of 245721591811 is 118195127542.

It is a cyclic number.

It is not a de Polignac number, because 245721591811 - 2⁹ = 245721591299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245721571811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550306 + ... + 891223.

It is an arithmetic number, because the mean of its divisors is an integer number (16762110840).

Almost surely, 2^245721591811 is an apocalyptic number.

245721591811 is a deficient number, since it is larger than the sum of its proper divisors (22472181629).

245721591811 is a wasteful number, since it uses less digits than its factorization.

245721591811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441854.

The product of its digits is 201600, while the sum is 46.

The spelling of 245721591811 in words is "two hundred forty-five billion, seven hundred twenty-one million, five hundred ninety-one thousand, eight hundred eleven".