245316221261 has 4 divisors (see below), whose sum is σ = 245335094592. Its totient is φ = 245297347932.

The previous prime is 245316221237. The next prime is 245316221263. The reversal of 245316221261 is 162122613542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 245316221261 - 2²² = 245312026957 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 (245316221263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9417155 + ... + 9443168.

It is an arithmetic number, because the mean of its divisors is an integer number (61333773648).

Almost surely, 2^245316221261 is an apocalyptic number.

It is an amenable number.

245316221261 is a deficient number, since it is larger than the sum of its proper divisors (18873331).

245316221261 is a wasteful number, since it uses less digits than its factorization.

245316221261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18873330.

The product of its digits is 34560, while the sum is 35.

The spelling of 245316221261 in words is "two hundred forty-five billion, three hundred sixteen million, two hundred twenty-one thousand, two hundred sixty-one".