309988899505 has 16 divisors (see below), whose sum is σ = 383194649664. Its totient is φ = 240559640640.

The previous prime is 309988899491. The next prime is 309988899511. The reversal of 309988899505 is 505998889903.

It is not a de Polignac number, because 309988899505 - 2¹³ = 309988891313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2469907 + ... + 2592376.

It is an arithmetic number, because the mean of its divisors is an integer number (23949665604).

Almost surely, 2^309988899505 is an apocalyptic number.

It is an amenable number.

309988899505 is a deficient number, since it is larger than the sum of its proper divisors (73205750159).

309988899505 is a wasteful number, since it uses less digits than its factorization.

309988899505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062656.

The product of its (nonzero) digits is 251942400, while the sum is 73.

The spelling of 309988899505 in words is "three hundred nine billion, nine hundred eighty-eight million, eight hundred ninety-nine thousand, five hundred five".