1091851837440 has 2016 divisors, whose sum is σ = 4675579757280. Its totient is φ = 216413503488.

The previous prime is 1091851837429. The next prime is 1091851837451. The reversal of 1091851837440 is 447381581901.

It is an interprime number because it is at equal distance from previous prime (1091851837429) and next prime (1091851837451).

It is a super-2 number, since 2×1091851837440² (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 143 ways as a sum of consecutive naturals, for example, 29509509102 + ... + 29509509138.

Almost surely, 2^{1091851837440} is an apocalyptic number.

1091851837440 is a gapful number since it is divisible by the number (10) 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 1091851837440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2337789878640).

1091851837440 is an abundant number, since it is smaller than the sum of its proper divisors (3583727919840).

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

1091851837440 is a wasteful number, since it uses less digits than its factorization.

1091851837440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

It can be divided in two parts, 1091851 and 837440, that added together give a palindrome (1929291).

The spelling of 1091851837440 in words is "one trillion, ninety-one billion, eight hundred fifty-one million, eight hundred thirty-seven thousand, four hundred forty".