1994263649856 has 189 divisors, whose sum is σ = 5923022994291. Its totient is φ = 641515650048.

The previous prime is 1994263649821. The next prime is 1994263649869. The reversal of 1994263649856 is 6589463624991.

The square root of 1994263649856 is 1412184.

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

1994263649856 is a `hidden beast` number, since 1 + 9 + 9 + 426 + 3 + 64 + 98 + 56 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 868967009856 + 1125296640000 = 932184^2 + 1060800^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 982879050 + ... + 982881078.

Almost surely, 2^{1994263649856} is an apocalyptic number.

1994263649856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1994263649856 is the 1412184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1994263649856

1994263649856 is an abundant number, since it is smaller than the sum of its proper divisors (3928759344435).

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

1994263649856 is an frugal number, since it uses more digits than its factorization.

1994263649856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134 (or 2063 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 72.

The spelling of 1994263649856 in words is "one trillion, nine hundred ninety-four billion, two hundred sixty-three million, six hundred forty-nine thousand, eight hundred fifty-six".