1009478879999 has 4 divisors (see below), whose sum is σ = 1010696587560. Its totient is φ = 1008261172440.

The previous prime is 1009478879971. The next prime is 1009478880023. The reversal of 1009478879999 is 9999788749001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1009478879999 - 2⁸ = 1009478879743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009478879939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608852537 + ... + 608854194.

It is an arithmetic number, because the mean of its divisors is an integer number (252674146890).

Almost surely, 2^{1009478879999} is an apocalyptic number.

1009478879999 is a deficient number, since it is larger than the sum of its proper divisors (1217707561).

1009478879999 is an equidigital number, since it uses as much as digits as its factorization.

1009478879999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217707560.

The product of its (nonzero) digits is 740710656, while the sum is 80.

The spelling of 1009478879999 in words is "one trillion, nine billion, four hundred seventy-eight million, eight hundred seventy-nine thousand, nine hundred ninety-nine".