2661256512105 has 16 divisors (see below), whose sum is σ = 4295691930240. Its totient is φ = 1406776302848.

The previous prime is 2661256512073. The next prime is 2661256512127. The reversal of 2661256512105 is 5012156521662.

2661256512105 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2661256512105 - 2⁵ = 2661256512073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785029725 + ... + 785033114.

It is an arithmetic number, because the mean of its divisors is an integer number (268480745640).

Almost surely, 2^{2661256512105} is an apocalyptic number.

It is an amenable number.

2661256512105 is a deficient number, since it is larger than the sum of its proper divisors (1634435418135).

2661256512105 is a wasteful number, since it uses less digits than its factorization.

2661256512105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570062960.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 2661256512105 in words is "two trillion, six hundred sixty-one billion, two hundred fifty-six million, five hundred twelve thousand, one hundred five".