1213909689755 has 8 divisors (see below), whose sum is σ = 1664790431712. Its totient is φ = 832395215808.

The previous prime is 1213909689631. The next prime is 1213909689791. The reversal of 1213909689755 is 5579869093121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213909689755 - 2²⁸ = 1213641254299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213909689691 and 1213909689700.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17341566962 + ... + 17341567031.

It is an arithmetic number, because the mean of its divisors is an integer number (208098803964).

Almost surely, 2^{1213909689755} is an apocalyptic number.

1213909689755 is a deficient number, since it is larger than the sum of its proper divisors (450880741957).

1213909689755 is an equidigital number, since it uses as much as digits as its factorization.

1213909689755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34683134005.

The product of its (nonzero) digits is 36741600, while the sum is 65.

The spelling of 1213909689755 in words is "one trillion, two hundred thirteen billion, nine hundred nine million, six hundred eighty-nine thousand, seven hundred fifty-five".