1881791342656 has 21 divisors (see below), whose sum is σ = 3734201472781. Its totient is φ = 940890184192.

The previous prime is 1881791342593. The next prime is 1881791342657. The reversal of 1881791342656 is 6562431971881.

The square root of 1881791342656 is 1371784.

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., 260712360000 + 1621078982656 = 510600^2 + 1273216^2 .

It is a super-2 number, since 2×1881791342656² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1881791342594 and 1881791342603.

It is not an unprimeable number, because it can be changed into a prime (1881791342657) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10888536 + ... + 11060008.

Almost surely, 2^{1881791342656} is an apocalyptic number.

1881791342656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1881791342656 is the 1371784-th square number.

It is an amenable number.

1881791342656 is a deficient number, since it is larger than the sum of its proper divisors (1852410130125).

1881791342656 is an frugal number, since it uses more digits than its factorization.

1881791342656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342958 (or 171475 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 61.

The spelling of 1881791342656 in words is "one trillion, eight hundred eighty-one billion, seven hundred ninety-one million, three hundred forty-two thousand, six hundred fifty-six".