1227156394464 has 2880 divisors, whose sum is σ = 5377832570880. Its totient is φ = 266051174400.

The previous prime is 1227156394459. The next prime is 1227156394507. The reversal of 1227156394464 is 4644936517221.

1227156394464 is a `hidden beast` number, since 1 + 2 + 2 + 71 + 563 + 9 + 4 + 4 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1227156394464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 16810361532 + ... + 16810361604.

It is an arithmetic number, because the mean of its divisors is an integer number (1867302976).

Almost surely, 2^{1227156394464} is an apocalyptic number.

1227156394464 is a gapful number since it is divisible by the number (14) 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 1227156394464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2688916285440).

1227156394464 is an abundant number, since it is smaller than the sum of its proper divisors (4150676176416).

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

1227156394464 is a wasteful number, since it uses less digits than its factorization.

1227156394464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 159 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 54.

The spelling of 1227156394464 in words is "one trillion, two hundred twenty-seven billion, one hundred fifty-six million, three hundred ninety-four thousand, four hundred sixty-four".