12699299610261 has 72 divisors (see below), whose sum is σ = 21395381461272. Its totient is φ = 7227951667200.

The previous prime is 12699299610229. The next prime is 12699299610271. The reversal of 12699299610261 is 16201699299621.

12699299610261 is a `hidden beast` number, since 1 + 2 + 6 + 9 + 9 + 2 + 9 + 9 + 610 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9020982215025 + 3678317395236 = 3003495^2 + 1917894^2 .

It is not a de Polignac number, because 12699299610261 - 2⁵ = 12699299610229 is a prime.

It is a super-2 number, since 2×12699299610261² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699299610271) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7709931 + ... + 9210951.

It is an arithmetic number, because the mean of its divisors is an integer number (297158075851).

Almost surely, 2^{12699299610261} is an apocalyptic number.

12699299610261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12699299610261 is a deficient number, since it is larger than the sum of its proper divisors (8696081851011).

12699299610261 is a wasteful number, since it uses less digits than its factorization.

12699299610261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501523 (or 1501509 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 63.

It can be divided in two parts, 12699 and 299610261, that added together give a triangular number (299622960 = T₂₄₄₇₉).

The spelling of 12699299610261 in words is "twelve trillion, six hundred ninety-nine billion, two hundred ninety-nine million, six hundred ten thousand, two hundred sixty-one".