670236557 has 2 divisors, whose sum is σ = 670236558. Its totient is φ = 670236556.

The previous prime is 670236503. The next prime is 670236559. The reversal of 670236557 is 755632076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588984361 + 81252196 = 24269^2 + 9014^2 .

It is a cyclic number.

It is not a de Polignac number, because 670236557 - 2⁶ = 670236493 is a prime.

Together with 670236559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670236559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335118278 + 335118279.

It is an arithmetic number, because the mean of its divisors is an integer number (335118279).

Almost surely, 2^670236557 is an apocalyptic number.

It is an amenable number.

670236557 is a deficient number, since it is larger than the sum of its proper divisors (1).

670236557 is an equidigital number, since it uses as much as digits as its factorization.

670236557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264600, while the sum is 41.

The square root of 670236557 is about 25888.9273049310. The cubic root of 670236557 is about 875.1369829621.

The spelling of 670236557 in words is "six hundred seventy million, two hundred thirty-six thousand, five hundred fifty-seven".