2173505679 has 6 divisors (see below), whose sum is σ = 3139508216. Its totient is φ = 1449003780.

The previous prime is 2173505657. The next prime is 2173505693. The reversal of 2173505679 is 9765053712.

2173505679 is a `hidden beast` number, since 2 + 1 + 73 + 505 + 6 + 79 = 666.

It is not a de Polignac number, because 2173505679 - 2¹⁵ = 2173472911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173505629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120750307 + ... + 120750324.

Almost surely, 2^2173505679 is an apocalyptic number.

2173505679 is a deficient number, since it is larger than the sum of its proper divisors (966002537).

2173505679 is a wasteful number, since it uses less digits than its factorization.

2173505679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241500637 (or 241500634 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 2173505679 is about 46620.8717099970. The cubic root of 2173505679 is about 1295.3493944515.

The spelling of 2173505679 in words is "two billion, one hundred seventy-three million, five hundred five thousand, six hundred seventy-nine".