2645960942881 has 9 divisors (see below), whose sum is σ = 2650995188121. Its totient is φ = 2640936248832.

The previous prime is 2645960942861. The next prime is 2645960942897. The reversal of 2645960942881 is 1882490695462.

The square root of 2645960942881 is 1626641.

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 492580789281 + 2153380153600 = 701841^2 + 1467440^2 .

It is not a de Polignac number, because 2645960942881 - 2¹³ = 2645960934689 is a prime.

It is a super-2 number, since 2×2645960942881² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645960942851) 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, 1094728185 + ... + 1094730601.

Almost surely, 2^{2645960942881} is an apocalyptic number.

2645960942881 is the 1626641-st square number.

2645960942881 is the 813321-st centered octagonal number.

It is an amenable number.

2645960942881 is a deficient number, since it is larger than the sum of its proper divisors (5034245240).

2645960942881 is an frugal number, since it uses more digits than its factorization.

2645960942881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6180 (or 3090 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 64.

Multiplying 2645960942881 by its sum of digits (64), we get a square (169341500344384 = 13013128²).

The spelling of 2645960942881 in words is "two trillion, six hundred forty-five billion, nine hundred sixty million, nine hundred forty-two thousand, eight hundred eighty-one".