669583157 has 2 divisors, whose sum is σ = 669583158. Its totient is φ = 669583156.

The previous prime is 669583129. The next prime is 669583171. The reversal of 669583157 is 751385966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412333636 + 257249521 = 20306^2 + 16039^2 .

It is a cyclic number.

It is not a de Polignac number, because 669583157 - 2⁶ = 669583093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669583127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334791578 + 334791579.

It is an arithmetic number, because the mean of its divisors is an integer number (334791579).

Almost surely, 2^669583157 is an apocalyptic number.

It is an amenable number.

669583157 is a deficient number, since it is larger than the sum of its proper divisors (1).

669583157 is an equidigital number, since it uses as much as digits as its factorization.

669583157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 50.

The square root of 669583157 is about 25876.3049332782. The cubic root of 669583157 is about 874.8525060779.

The spelling of 669583157 in words is "six hundred sixty-nine million, five hundred eighty-three thousand, one hundred fifty-seven".