1209863579857 has 8 divisors (see below), whose sum is σ = 1229596494656. Its totient is φ = 1190179937232.

The previous prime is 1209863579839. The next prime is 1209863579863. The reversal of 1209863579857 is 7589753689021.

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 1209863579857 - 2¹⁵ = 1209863547089 is a prime.

It is a super-2 number, since 2×1209863579857² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209863579257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12268533 + ... + 12366754.

It is an arithmetic number, because the mean of its divisors is an integer number (153699561832).

Almost surely, 2^{1209863579857} is an apocalyptic number.

It is an amenable number.

1209863579857 is a deficient number, since it is larger than the sum of its proper divisors (19732914799).

1209863579857 is an equidigital number, since it uses as much as digits as its factorization.

1209863579857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24636087.

The product of its (nonzero) digits is 228614400, while the sum is 70.

The spelling of 1209863579857 in words is "one trillion, two hundred nine billion, eight hundred sixty-three million, five hundred seventy-nine thousand, eight hundred fifty-seven".