1645768245 has 16 divisors (see below), whose sum is σ = 2872613952. Its totient is φ = 797948160.

The previous prime is 1645768217. The next prime is 1645768247. The reversal of 1645768245 is 5428675461.

It is not a de Polignac number, because 1645768245 - 2¹⁵ = 1645735477 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1645768194 and 1645768203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645768247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4987012 + ... + 4987341.

It is an arithmetic number, because the mean of its divisors is an integer number (179538372).

Almost surely, 2^1645768245 is an apocalyptic number.

1645768245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645768245 is a deficient number, since it is larger than the sum of its proper divisors (1226845707).

1645768245 is a wasteful number, since it uses less digits than its factorization.

1645768245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9974372.

The product of its digits is 1612800, while the sum is 48.

The square root of 1645768245 is about 40568.0692786827. The cubic root of 1645768245 is about 1180.6546795596.

The spelling of 1645768245 in words is "one billion, six hundred forty-five million, seven hundred sixty-eight thousand, two hundred forty-five".