1697050738681 has 15 divisors (see below), whose sum is σ = 1758795046491. Its totient is φ = 1637473947984.

The previous prime is 1697050738637. The next prime is 1697050738709. The reversal of 1697050738681 is 1868370507961.

The square root of 1697050738681 is 1302709.

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

It can be written as a sum of positive squares in 7 ways, for example, as 1043378488681 + 653672250000 = 1021459^2 + 808500^2 .

It is not a de Polignac number, because 1697050738681 - 2⁷ = 1697050738553 is a prime.

It is a super-2 number, since 2×1697050738681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1697057738681) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1095577495 + ... + 1095579043.

Almost surely, 2^{1697050738681} is an apocalyptic number.

1697050738681 is the 1302709-th square number.

1697050738681 is the 651355-th centered octagonal number.

It is an amenable number.

1697050738681 is a deficient number, since it is larger than the sum of its proper divisors (61744307810).

1697050738681 is an frugal number, since it uses more digits than its factorization.

1697050738681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 1578 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 1697050738681 in words is "one trillion, six hundred ninety-seven billion, fifty million, seven hundred thirty-eight thousand, six hundred eighty-one".