1264412651256 has 96 divisors (see below), whose sum is σ = 3453651302400. Its totient is φ = 417881298240.

The previous prime is 1264412651233. The next prime is 1264412651269. The reversal of 1264412651256 is 6521562144621.

1264412651256 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 4 + 126 + 512 + 5 + 6 = 666.

It is a congruent number.

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, 14321215 + ... + 14409233.

It is an arithmetic number, because the mean of its divisors is an integer number (35975534400).

Almost surely, 2^{1264412651256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264412651256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1726825651200).

1264412651256 is an abundant number, since it is smaller than the sum of its proper divisors (2189238651144).

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

1264412651256 is a wasteful number, since it uses less digits than its factorization.

1264412651256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89729 (or 89722 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

Adding to 1264412651256 its reverse (6521562144621), we get a palindrome (7785974795877).

The spelling of 1264412651256 in words is "one trillion, two hundred sixty-four billion, four hundred twelve million, six hundred fifty-one thousand, two hundred fifty-six".