221760831625345 has 4 divisors (see below), whose sum is σ = 266112997950420. Its totient is φ = 177408665300272.

The previous prime is 221760831625327. The next prime is 221760831625363. The reversal of 221760831625345 is 543526138067122.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (221760831625327) and next prime (221760831625363).

It can be written as a sum of positive squares in 2 ways, for example, as 120014150279409 + 101746681345936 = 10955097^2 + 10086956^2 .

It is a cyclic number.

It is not a de Polignac number, because 221760831625345 - 2⁹ = 221760831624833 is a prime.

It is a super-2 number, since 2×221760831625345² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22176083162530 + ... + 22176083162539.

It is an arithmetic number, because the mean of its divisors is an integer number (66528249487605).

Almost surely, 2^{221760831625345} is an apocalyptic number.

It is an amenable number.

221760831625345 is a deficient number, since it is larger than the sum of its proper divisors (44352166325075).

221760831625345 is an equidigital number, since it uses as much as digits as its factorization.

221760831625345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44352166325074.

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 221760831625345 in words is "two hundred twenty-one trillion, seven hundred sixty billion, eight hundred thirty-one million, six hundred twenty-five thousand, three hundred forty-five".