1056557447388 has 72 divisors (see below), whose sum is σ = 2703451121280. Its totient is φ = 347898650400.

The previous prime is 1056557447371. The next prime is 1056557447389. The reversal of 1056557447388 is 8837447556501.

It is a happy number.

1056557447388 is a `hidden beast` number, since 1 + 0 + 5 + 6 + 557 + 4 + 4 + 73 + 8 + 8 = 666.

It is a super-2 number, since 2×1056557447388² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056557447389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 430131 + ... + 1515957.

It is an arithmetic number, because the mean of its divisors is an integer number (37547932240).

Almost surely, 2^{1056557447388} is an apocalyptic number.

1056557447388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1056557447388 is an abundant number, since it is smaller than the sum of its proper divisors (1646893673892).

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

1056557447388 is a wasteful number, since it uses less digits than its factorization.

1056557447388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086167 (or 1086162 counting only the distinct ones).

The product of its (nonzero) digits is 112896000, while the sum is 63.

The spelling of 1056557447388 in words is "one trillion, fifty-six billion, five hundred fifty-seven million, four hundred forty-seven thousand, three hundred eighty-eight".