1677939394609 has 9 divisors (see below), whose sum is σ = 1684066619809. Its totient is φ = 1671834395920.

The previous prime is 1677939394591. The next prime is 1677939394613. The reversal of 1677939394609 is 9064939397761.

The square root of 1677939394609 is 1295353.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1049610495025 + 628328899584 = 1024505^2 + 792672^2 .

It is not a de Polignac number, because 1677939394609 - 2⁵ = 1677939394577 is a prime.

It is a super-3 number, since 3×1677939394609³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1677939394009) 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, 379536219 + ... + 379540639.

Almost surely, 2^{1677939394609} is an apocalyptic number.

1677939394609 is the 1295353-rd square number.

1677939394609 is the 647677-th centered octagonal number.

It is an amenable number.

1677939394609 is a deficient number, since it is larger than the sum of its proper divisors (6127225200).

1677939394609 is an frugal number, since it uses more digits than its factorization.

1677939394609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9428 (or 4714 counting only the distinct ones).

The product of its (nonzero) digits is 416649744, while the sum is 73.

The spelling of 1677939394609 in words is "one trillion, six hundred seventy-seven billion, nine hundred thirty-nine million, three hundred ninety-four thousand, six hundred nine".