2117505278 has 32 divisors (see below), whose sum is σ = 3897704448. Its totient is φ = 842083200.

The previous prime is 2117505277. The next prime is 2117505317. The reversal of 2117505278 is 8725057112.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117505277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45758 + ... + 79553.

It is an arithmetic number, because the mean of its divisors is an integer number (121803264).

Almost surely, 2^2117505278 is an apocalyptic number.

2117505278 is a deficient number, since it is larger than the sum of its proper divisors (1780199170).

2117505278 is a wasteful number, since it uses less digits than its factorization.

2117505278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125408.

The product of its (nonzero) digits is 39200, while the sum is 38.

The square root of 2117505278 is about 46016.3588085802. The cubic root of 2117505278 is about 1284.1275607362.

The spelling of 2117505278 in words is "two billion, one hundred seventeen million, five hundred five thousand, two hundred seventy-eight".