1646126857 has 2 divisors, whose sum is σ = 1646126858. Its totient is φ = 1646126856.

The previous prime is 1646126851. The next prime is 1646126861. The reversal of 1646126857 is 7586216461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066087801 + 580039056 = 32651^2 + 24084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646126857 - 2²⁷ = 1511909129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1646126851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823063428 + 823063429.

It is an arithmetic number, because the mean of its divisors is an integer number (823063429).

Almost surely, 2^1646126857 is an apocalyptic number.

It is an amenable number.

1646126857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646126857 is an equidigital number, since it uses as much as digits as its factorization.

1646126857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 46.

The square root of 1646126857 is about 40572.4889179848. The cubic root of 1646126857 is about 1180.7404280013.

The spelling of 1646126857 in words is "one billion, six hundred forty-six million, one hundred twenty-six thousand, eight hundred fifty-seven".