1366261006555 has 16 divisors (see below), whose sum is σ = 1642166323200. Its totient is φ = 1091240867808.

The previous prime is 1366261006553. The next prime is 1366261006573. The reversal of 1366261006555 is 5556001626631.

It is a cyclic number.

It is not a de Polignac number, because 1366261006555 - 2¹ = 1366261006553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1366261006553) 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, 14154346 + ... + 14250544.

It is an arithmetic number, because the mean of its divisors is an integer number (102635395200).

Almost surely, 2^{1366261006555} is an apocalyptic number.

1366261006555 is a deficient number, since it is larger than the sum of its proper divisors (275905316645).

1366261006555 is an equidigital number, since it uses as much as digits as its factorization.

1366261006555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100770.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 1366261006555 in words is "one trillion, three hundred sixty-six billion, two hundred sixty-one million, six thousand, five hundred fifty-five".