1646040023 has 2 divisors, whose sum is σ = 1646040024. Its totient is φ = 1646040022.

The previous prime is 1646039999. The next prime is 1646040041. The reversal of 1646040023 is 3200406461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646040023 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1646039974 and 1646040001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646040223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823020011 + 823020012.

It is an arithmetic number, because the mean of its divisors is an integer number (823020012).

Almost surely, 2^1646040023 is an apocalyptic number.

1646040023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646040023 is an equidigital number, since it uses as much as digits as its factorization.

1646040023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1646040023 is about 40571.4187945159. The cubic root of 1646040023 is about 1180.7196660904.

Adding to 1646040023 its reverse (3200406461), we get a palindrome (4846446484).

The spelling of 1646040023 in words is "one billion, six hundred forty-six million, forty thousand, twenty-three".