1645105907 has 2 divisors, whose sum is σ = 1645105908. Its totient is φ = 1645105906.

The previous prime is 1645105897. The next prime is 1645105919. The reversal of 1645105907 is 7095015461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645105907 - 2¹² = 1645101811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645101907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822552953 + 822552954.

It is an arithmetic number, because the mean of its divisors is an integer number (822552954).

Almost surely, 2^1645105907 is an apocalyptic number.

1645105907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645105907 is an equidigital number, since it uses as much as digits as its factorization.

1645105907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1645105907 is about 40559.9051650765. The cubic root of 1645105907 is about 1180.4962738244.

The spelling of 1645105907 in words is "one billion, six hundred forty-five million, one hundred five thousand, nine hundred seven".