1645199503 has 2 divisors, whose sum is σ = 1645199504. Its totient is φ = 1645199502.

The previous prime is 1645199461. The next prime is 1645199513. The reversal of 1645199503 is 3059915461.

It is a strong prime.

It is an emirp because it is prime and its reverse (3059915461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645199503 - 2²⁹ = 1108328591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645199503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645199513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822599751 + 822599752.

It is an arithmetic number, because the mean of its divisors is an integer number (822599752).

Almost surely, 2^1645199503 is an apocalyptic number.

1645199503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645199503 is an equidigital number, since it uses as much as digits as its factorization.

1645199503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 1645199503 is about 40561.0589482079. The cubic root of 1645199503 is about 1180.5186609614.

The spelling of 1645199503 in words is "one billion, six hundred forty-five million, one hundred ninety-nine thousand, five hundred three".