478839109515 has 16 divisors (see below), whose sum is σ = 825076619808. Its totient is φ = 235736176896.

The previous prime is 478839109513. The next prime is 478839109517. The reversal of 478839109515 is 515901938874.

It is an interprime number because it is at equal distance from previous prime (478839109513) and next prime (478839109517).

It is not a de Polignac number, because 478839109515 - 2¹ = 478839109513 is a prime.

It is a super-2 number, since 2×478839109515² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (478839109513) 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, 1227792394 + ... + 1227792783.

It is an arithmetic number, because the mean of its divisors is an integer number (51567288738).

Almost surely, 2^478839109515 is an apocalyptic number.

478839109515 is a deficient number, since it is larger than the sum of its proper divisors (346237510293).

478839109515 is a wasteful number, since it uses less digits than its factorization.

478839109515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455585198.

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 478839109515 in words is "four hundred seventy-eight billion, eight hundred thirty-nine million, one hundred nine thousand, five hundred fifteen".