1226531456640 has 384 divisors, whose sum is σ = 5007334550400. Its totient is φ = 270682546176.

The previous prime is 1226531456593. The next prime is 1226531456653. The reversal of 1226531456640 is 466541356221.

1226531456640 is a `hidden beast` number, since 1 + 2 + 2 + 6 + 531 + 4 + 56 + 64 + 0 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 644799 + ... + 1693761.

It is an arithmetic number, because the mean of its divisors is an integer number (13039933725).

Almost surely, 2^{1226531456640} is an apocalyptic number.

1226531456640 is a gapful number since it is divisible by the number (10) 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 1226531456640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2503667275200).

1226531456640 is an abundant number, since it is smaller than the sum of its proper divisors (3780803093760).

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

1226531456640 is a wasteful number, since it uses less digits than its factorization.

1226531456640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049024 (or 1049009 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 1226531456640 in words is "one trillion, two hundred twenty-six billion, five hundred thirty-one million, four hundred fifty-six thousand, six hundred forty".