2661031052261 has 8 divisors (see below), whose sum is σ = 2717742585600. Its totient is φ = 2604323429488.

The previous prime is 2661031052237. The next prime is 2661031052293. The reversal of 2661031052261 is 1622501301662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661031052261 is a prime.

It is a super-2 number, since 2×2661031052261² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661031055261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418835 + ... + 2344671.

It is an arithmetic number, because the mean of its divisors is an integer number (339717823200).

Almost surely, 2^{2661031052261} is an apocalyptic number.

It is an amenable number.

2661031052261 is a deficient number, since it is larger than the sum of its proper divisors (56711533339).

2661031052261 is a wasteful number, since it uses less digits than its factorization.

2661031052261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955283.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 2661031052261 in words is "two trillion, six hundred sixty-one billion, thirty-one million, fifty-two thousand, two hundred sixty-one".