1226225561220 has 72 divisors (see below), whose sum is σ = 4057691863680. Its totient is φ = 297266802240.

The previous prime is 1226225561203. The next prime is 1226225561243. The reversal of 1226225561220 is 221655226221.

1226225561220 is a `hidden beast` number, since 1 + 2 + 2 + 622 + 5 + 5 + 6 + 1 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309650940 + ... + 309654899.

It is an arithmetic number, because the mean of its divisors is an integer number (56356831440).

Almost surely, 2^{1226225561220} is an apocalyptic number.

1226225561220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226225561220 is an abundant number, since it is smaller than the sum of its proper divisors (2831466302460).

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

1226225561220 is a wasteful number, since it uses less digits than its factorization.

1226225561220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619305865 (or 619305860 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 1226225561220 in words is "one trillion, two hundred twenty-six billion, two hundred twenty-five million, five hundred sixty-one thousand, two hundred twenty".