1356669857 has 2 divisors, whose sum is σ = 1356669858. Its totient is φ = 1356669856.

The previous prime is 1356669841. The next prime is 1356669859. The reversal of 1356669857 is 7589666531.

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., 792084736 + 564585121 = 28144^2 + 23761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356669857 - 2⁴ = 1356669841 is a prime.

Together with 1356669859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1356669859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678334928 + 678334929.

It is an arithmetic number, because the mean of its divisors is an integer number (678334929).

Almost surely, 2^1356669857 is an apocalyptic number.

It is an amenable number.

1356669857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356669857 is an equidigital number, since it uses as much as digits as its factorization.

1356669857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 56.

The square root of 1356669857 is about 36832.9995656069. Note that the first 3 decimals coincide. The cubic root of 1356669857 is about 1107.0266056630.

The spelling of 1356669857 in words is "one billion, three hundred fifty-six million, six hundred sixty-nine thousand, eight hundred fifty-seven".