2115891244478 has 16 divisors (see below), whose sum is σ = 3465074626560. Its totient is φ = 961016765400.

The previous prime is 2115891244451. The next prime is 2115891244507. The reversal of 2115891244478 is 8744421985112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37570328 + ... + 37626603.

It is an arithmetic number, because the mean of its divisors is an integer number (216567164160).

Almost surely, 2^{2115891244478} is an apocalyptic number.

2115891244478 is a deficient number, since it is larger than the sum of its proper divisors (1349183382082).

2115891244478 is a wasteful number, since it uses less digits than its factorization.

2115891244478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75198223.

The product of its digits is 5160960, while the sum is 56.

The spelling of 2115891244478 in words is "two trillion, one hundred fifteen billion, eight hundred ninety-one million, two hundred forty-four thousand, four hundred seventy-eight".