1997937018256 has 45 divisors (see below), whose sum is σ = 3912395583681. Its totient is φ = 988398475776.

The previous prime is 1997937018251. The next prime is 1997937018281. The reversal of 1997937018256 is 6528107397991.

The square root of 1997937018256 is 1413484.

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

It can be written as a sum of positive squares in only one way, i.e., 897149952400 + 1100787065856 = 947180^2 + 1049184^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997937018191 and 1997937018200.

It is not an unprimeable number, because it can be changed into a prime (1997937018251) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 548429971 + ... + 548433613.

Almost surely, 2^{1997937018256} is an apocalyptic number.

1997937018256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1997937018256 is the 1413484-th square number.

It is an amenable number.

1997937018256 is a deficient number, since it is larger than the sum of its proper divisors (1914458565425).

1997937018256 is an frugal number, since it uses more digits than its factorization.

1997937018256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7488 (or 3742 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 67.

The spelling of 1997937018256 in words is "one trillion, nine hundred ninety-seven billion, nine hundred thirty-seven million, eighteen thousand, two hundred fifty-six".