669061157 has 2 divisors, whose sum is σ = 669061158. Its totient is φ = 669061156.

The previous prime is 669061153. The next prime is 669061243. The reversal of 669061157 is 751160966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 564490081 + 104571076 = 23759^2 + 10226^2 .

It is a cyclic number.

It is not a de Polignac number, because 669061157 - 2² = 669061153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669061153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334530578 + 334530579.

It is an arithmetic number, because the mean of its divisors is an integer number (334530579).

Almost surely, 2^669061157 is an apocalyptic number.

It is an amenable number.

669061157 is a deficient number, since it is larger than the sum of its proper divisors (1).

669061157 is an equidigital number, since it uses as much as digits as its factorization.

669061157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 669061157 is about 25866.2165188494. The cubic root of 669061157 is about 874.6251050313.

The spelling of 669061157 in words is "six hundred sixty-nine million, sixty-one thousand, one hundred fifty-seven".