1225798656 has 44 divisors (see below), whose sum is σ = 3267208512. Its totient is φ = 408598528.

The previous prime is 1225798649. The next prime is 1225798663. The reversal of 1225798656 is 6568975221.

It is an interprime number because it is at equal distance from previous prime (1225798649) and next prime (1225798663).

It is a junction number, because it is equal to n+sod(n) for n = 1225798599 and 1225798608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196440 + ... + 202583.

Almost surely, 2^1225798656 is an apocalyptic number.

1225798656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1225798656 is an abundant number, since it is smaller than the sum of its proper divisors (2041409856).

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

1225798656 is an equidigital number, since it uses as much as digits as its factorization.

1225798656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399046 (or 399028 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 51.

The square root of 1225798656 is about 35011.4075124094. The cubic root of 1225798656 is about 1070.2199611844.

The spelling of 1225798656 in words is "one billion, two hundred twenty-five million, seven hundred ninety-eight thousand, six hundred fifty-six".