12534651665761 has 9 divisors (see below), whose sum is σ = 12548002670931. Its totient is φ = 12521314862184.

The previous prime is 12534651665749. The next prime is 12534651665803. The reversal of 12534651665761 is 16756615643521.

The square root of 12534651665761 is 3540431.

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., 11843791473361 + 690860192400 = 3441481^2 + 831180^2 .

It is not a de Polignac number, because 12534651665761 - 2¹¹ = 12534651663713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12534651665696 and 12534651665705.

It is not an unprimeable number, because it can be changed into a prime (12534651665561) 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, 6333830070 + ... + 6333832048.

Almost surely, 2^{12534651665761} is an apocalyptic number.

12534651665761 is the 3540431-st square number.

12534651665761 is the 1770216-th centered octagonal number.

It is an amenable number.

12534651665761 is a deficient number, since it is larger than the sum of its proper divisors (13351005170).

12534651665761 is an frugal number, since it uses more digits than its factorization.

12534651665761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7536 (or 3768 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 58.

The spelling of 12534651665761 in words is "twelve trillion, five hundred thirty-four billion, six hundred fifty-one million, six hundred sixty-five thousand, seven hundred sixty-one".