2168504400478 has 16 divisors (see below), whose sum is σ = 3503008053216. Its totient is φ = 1000836925920.

The previous prime is 2168504400463. The next prime is 2168504400481. The reversal of 2168504400478 is 8740044058612.

It is a happy number.

It is a super-2 number, since 2×2168504400478² (a number of 25 digits) contains 22 as substring.

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, 2165800 + ... + 3004612.

It is an arithmetic number, because the mean of its divisors is an integer number (218938003326).

Almost surely, 2^{2168504400478} is an apocalyptic number.

2168504400478 is a deficient number, since it is larger than the sum of its proper divisors (1334503652738).

2168504400478 is a wasteful number, since it uses less digits than its factorization.

2168504400478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938259.

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 2168504400478 in words is "two trillion, one hundred sixty-eight billion, five hundred four million, four hundred thousand, four hundred seventy-eight".