1091657647872 has 756 divisors, whose sum is σ = 3717149292360. Its totient is φ = 319206666240.

The previous prime is 1091657647831. The next prime is 1091657647987. The reversal of 1091657647872 is 2787467561901.

1091657647872 is a `hidden beast` number, since 1 + 0 + 9 + 16 + 576 + 47 + 8 + 7 + 2 = 666.

It is a super-2 number, since 2×1091657647872² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 654862783 + ... + 654864449.

Almost surely, 2^{1091657647872} is an apocalyptic number.

1091657647872 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 1091657647872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858574646180).

1091657647872 is an abundant number, since it is smaller than the sum of its proper divisors (2625491644488).

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

1091657647872 is an equidigital number, since it uses as much as digits as its factorization.

1091657647872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1712 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 1091657647872 in words is "one trillion, ninety-one billion, six hundred fifty-seven million, six hundred forty-seven thousand, eight hundred seventy-two".