2666861553955 has 32 divisors (see below), whose sum is σ = 3306343380480. Its totient is φ = 2063680792320.

The previous prime is 2666861553907. The next prime is 2666861554033. The reversal of 2666861553955 is 5593551686662.

It is not a de Polignac number, because 2666861553955 - 2⁹ = 2666861553443 is a prime.

It is a super-2 number, since 2×2666861553955² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 21108804 + ... + 21234766.

It is an arithmetic number, because the mean of its divisors is an integer number (103323230640).

Almost surely, 2^{2666861553955} is an apocalyptic number.

2666861553955 is a deficient number, since it is larger than the sum of its proper divisors (639481826525).

2666861553955 is a wasteful number, since it uses less digits than its factorization.

2666861553955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126891.

The product of its digits is 349920000, while the sum is 67.

The spelling of 2666861553955 in words is "two trillion, six hundred sixty-six billion, eight hundred sixty-one million, five hundred fifty-three thousand, nine hundred fifty-five".