1225555583616 has 384 divisors, whose sum is σ = 4343236410240. Its totient is φ = 323020431360.

The previous prime is 1225555583519. The next prime is 1225555583653. The reversal of 1225555583616 is 6163855555221.

It is a happy number.

1225555583616 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 5 + 55 + 583 + 6 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244570551 + ... + 244575561.

It is an arithmetic number, because the mean of its divisors is an integer number (11310511485).

Almost surely, 2^{1225555583616} is an apocalyptic number.

1225555583616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225555583616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171618205120).

1225555583616 is an abundant number, since it is smaller than the sum of its proper divisors (3117680826624).

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

1225555583616 is a wasteful number, since it uses less digits than its factorization.

1225555583616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384 (or 7369 counting only the distinct ones).

The product of its digits is 10800000, while the sum is 54.

The spelling of 1225555583616 in words is "one trillion, two hundred twenty-five billion, five hundred fifty-five million, five hundred eighty-three thousand, six hundred sixteen".