3427891978515 has 16 divisors (see below), whose sum is σ = 5612176635648. Its totient is φ = 1785692565216.

The previous prime is 3427891978493. The next prime is 3427891978549. The reversal of 3427891978515 is 5158791987243.

It is a happy number.

It is not a de Polignac number, because 3427891978515 - 2²⁵ = 3427858424083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3427891978515.

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, 2657279959 + ... + 2657281248.

It is an arithmetic number, because the mean of its divisors is an integer number (350761039728).

Almost surely, 2^{3427891978515} is an apocalyptic number.

3427891978515 is a deficient number, since it is larger than the sum of its proper divisors (2184284657133).

3427891978515 is a wasteful number, since it uses less digits than its factorization.

3427891978515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314561258.

The product of its digits is 152409600, while the sum is 69.

The spelling of 3427891978515 in words is "three trillion, four hundred twenty-seven billion, eight hundred ninety-one million, nine hundred seventy-eight thousand, five hundred fifteen".