679870505261 has 2 divisors, whose sum is σ = 679870505262. Its totient is φ = 679870505260.

The previous prime is 679870505233. The next prime is 679870505263. The reversal of 679870505261 is 162505078976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677468917225 + 2401588036 = 823085^2 + 49006^2 .

It is a cyclic number.

It is not a de Polignac number, because 679870505261 - 2¹⁴ = 679870488877 is a prime.

Together with 679870505263, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 679870505197 and 679870505206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (679870505263) 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 as a sum of consecutive naturals, namely, 339935252630 + 339935252631.

It is an arithmetic number, because the mean of its divisors is an integer number (339935252631).

Almost surely, 2^679870505261 is an apocalyptic number.

It is an amenable number.

679870505261 is a deficient number, since it is larger than the sum of its proper divisors (1).

679870505261 is an equidigital number, since it uses as much as digits as its factorization.

679870505261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 679870505261 in words is "six hundred seventy-nine billion, eight hundred seventy million, five hundred five thousand, two hundred sixty-one".