1225645116505 has 8 divisors (see below), whose sum is σ = 1485936760392. Its totient is φ = 970407679488.

The previous prime is 1225645116491. The next prime is 1225645116541. The reversal of 1225645116505 is 5056115465221.

It can be written as a sum of positive squares in 4 ways, for example, as 435631680576 + 790013435929 = 660024^2 + 888827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225645116505 is a prime.

It is a super-2 number, since 2×1225645116505² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263551182 + ... + 1263552151.

It is an arithmetic number, because the mean of its divisors is an integer number (185742095049).

Almost surely, 2^{1225645116505} is an apocalyptic number.

It is an amenable number.

1225645116505 is a deficient number, since it is larger than the sum of its proper divisors (260291643887).

1225645116505 is an equidigital number, since it uses as much as digits as its factorization.

1225645116505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527103435.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 1225645116505 in words is "one trillion, two hundred twenty-five billion, six hundred forty-five million, one hundred sixteen thousand, five hundred five".