1091640473856 has 81 divisors (see below), whose sum is σ = 3147613210651. Its totient is φ = 363863440896.

The previous prime is 1091640473849. The next prime is 1091640473863. The reversal of 1091640473856 is 6583740461901.

The square root of 1091640473856 is 1044816.

It is a perfect power (a square), and thus also a powerful number.

1091640473856 is a `hidden beast` number, since 1 + 0 + 9 + 164 + 0 + 473 + 8 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (1091640473849) and next prime (1091640473863).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 50140285 + ... + 50162051.

Almost surely, 2^{1091640473856} is an apocalyptic number.

1091640473856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1091640473856 is the 1044816-th square number.

It is an amenable number.

1091640473856 is an abundant number, since it is smaller than the sum of its proper divisors (2055972736795).

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

1091640473856 is an frugal number, since it uses more digits than its factorization.

1091640473856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43556 (or 21772 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 1091640473856 in words is "one trillion, ninety-one billion, six hundred forty million, four hundred seventy-three thousand, eight hundred fifty-six".