1256662249392 has 160 divisors (see below), whose sum is σ = 3750639943680. Its totient is φ = 358813128960.

The previous prime is 1256662249351. The next prime is 1256662249487. The reversal of 1256662249392 is 2939422666521.

It is a super-2 number, since 2×1256662249392² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41409 + ... + 1585887.

It is an arithmetic number, because the mean of its divisors is an integer number (23441499648).

Almost surely, 2^{1256662249392} is an apocalyptic number.

1256662249392 is a gapful number since it is divisible by the number (12) 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 1256662249392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875319971840).

1256662249392 is an abundant number, since it is smaller than the sum of its proper divisors (2493977694288).

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

1256662249392 is a wasteful number, since it uses less digits than its factorization.

1256662249392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544591 (or 1544585 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 57.

The spelling of 1256662249392 in words is "one trillion, two hundred fifty-six billion, six hundred sixty-two million, two hundred forty-nine thousand, three hundred ninety-two".