1908661060849 has 9 divisors (see below), whose sum is σ = 1961693233227. Its totient is φ = 1857025891224.

The previous prime is 1908661060829. The next prime is 1908661060913. The reversal of 1908661060849 is 9480601668091.

The square root of 1908661060849 is 1381543.

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., 1707896128225 + 200764932624 = 1306865^2 + 448068^2 .

It is not a de Polignac number, because 1908661060849 - 2⁹ = 1908661060337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1908661060793 and 1908661060802.

It is not an unprimeable number, because it can be changed into a prime (1908661060829) 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, 51098422 + ... + 51135760.

It is an arithmetic number, because the mean of its divisors is an integer number (217965914803).

Almost surely, 2^{1908661060849} is an apocalyptic number.

1908661060849 is the 1381543-rd square number.

1908661060849 is the 690772-nd centered octagonal number.

It is an amenable number.

1908661060849 is a deficient number, since it is larger than the sum of its proper divisors (53032172378).

1908661060849 is an frugal number, since it uses more digits than its factorization.

1908661060849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74752 (or 37376 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 58.

The spelling of 1908661060849 in words is "one trillion, nine hundred eight billion, six hundred sixty-one million, sixty thousand, eight hundred forty-nine".