1261341387063 has 16 divisors (see below), whose sum is σ = 1868682113760. Its totient is φ = 840881564928.

The previous prime is 1261341387011. The next prime is 1261341387209. The reversal of 1261341387063 is 3607831431621.

1261341387063 is a `hidden beast` number, since 1 + 261 + 3 + 4 + 1 + 387 + 0 + 6 + 3 = 666.

It is not a de Polignac number, because 1261341387063 - 2⁹ = 1261341386551 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261341387463) 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, 1682881 + ... + 2314037.

It is an arithmetic number, because the mean of its divisors is an integer number (116792632110).

Almost surely, 2^{1261341387063} is an apocalyptic number.

1261341387063 is a deficient number, since it is larger than the sum of its proper divisors (607340726697).

1261341387063 is an equidigital number, since it uses as much as digits as its factorization.

1261341387063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705183 (or 705177 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 1261341387063 in words is "one trillion, two hundred sixty-one billion, three hundred forty-one million, three hundred eighty-seven thousand, sixty-three".