2605196139844 has 27 divisors (see below), whose sum is σ = 4647042087037. Its totient is φ = 1277936816624.

The previous prime is 2605196139829. The next prime is 2605196139877. The reversal of 2605196139844 is 4489316915062.

The square root of 2605196139844 is 1614062.

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., 1878078384900 + 727117754944 = 1370430^2 + 852712^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 171082959 + ... + 171098185.

Almost surely, 2^{2605196139844} is an apocalyptic number.

2605196139844 is the 1614062-nd square number.

It is an amenable number.

2605196139844 is a deficient number, since it is larger than the sum of its proper divisors (2041845947193).

2605196139844 is an frugal number, since it uses more digits than its factorization.

2605196139844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30564 (or 15282 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 2605196139844 in words is "two trillion, six hundred five billion, one hundred ninety-six million, one hundred thirty-nine thousand, eight hundred forty-four".