1225218754816 has 81 divisors (see below), whose sum is σ = 2845229430771. Its totient is φ = 525040621056.

The previous prime is 1225218754813. The next prime is 1225218754817. The reversal of 1225218754816 is 6184578125221.

The square root of 1225218754816 is 1106896.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (1225218754813) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 123967411 + ... + 123977293.

Almost surely, 2^{1225218754816} is an apocalyptic number.

1225218754816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1225218754816 is the 1106896-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225218754816

1225218754816 is an abundant number, since it is smaller than the sum of its proper divisors (1620010675955).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225218754816 is an frugal number, since it uses more digits than its factorization.

1225218754816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19796 (or 9892 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 52.

The spelling of 1225218754816 in words is "one trillion, two hundred twenty-five billion, two hundred eighteen million, seven hundred fifty-four thousand, eight hundred sixteen".