2661217727709 has 16 divisors (see below), whose sum is σ = 3757069778688. Its totient is φ = 1669758554112.

The previous prime is 2661217727683. The next prime is 2661217727711. The reversal of 2661217727709 is 9077277121662.

It is not a de Polignac number, because 2661217727709 - 2⁵ = 2661217727677 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661217727789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3383869 + ... + 4095485.

It is an arithmetic number, because the mean of its divisors is an integer number (234816861168).

Almost surely, 2^{2661217727709} is an apocalyptic number.

It is an amenable number.

2661217727709 is a deficient number, since it is larger than the sum of its proper divisors (1095852050979).

2661217727709 is a wasteful number, since it uses less digits than its factorization.

2661217727709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784964.

The product of its (nonzero) digits is 6223392, while the sum is 57.

The spelling of 2661217727709 in words is "two trillion, six hundred sixty-one billion, two hundred seventeen million, seven hundred twenty-seven thousand, seven hundred nine".