679950173421 has 24 divisors (see below), whose sum is σ = 994796070840. Its totient is φ = 447480101376.

The previous prime is 679950173407. The next prime is 679950173423. The reversal of 679950173421 is 124371059976.

679950173421 is a `hidden beast` number, since 6 + 7 + 99 + 501 + 7 + 3 + 42 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 29973996900 + 649976176521 = 173130^2 + 806211^2 .

It is not a de Polignac number, because 679950173421 - 2¹⁷ = 679950042349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679950173423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193690 + ... + 1182123.

It is an arithmetic number, because the mean of its divisors is an integer number (41449836285).

Almost surely, 2^679950173421 is an apocalyptic number.

It is an amenable number.

679950173421 is a deficient number, since it is larger than the sum of its proper divisors (314845897419).

679950173421 is a wasteful number, since it uses less digits than its factorization.

679950173421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376525 (or 1376522 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 679950173421 in words is "six hundred seventy-nine billion, nine hundred fifty million, one hundred seventy-three thousand, four hundred twenty-one".