1645963850 has 24 divisors (see below), whose sum is σ = 3103437900. Its totient is φ = 649365120.

The previous prime is 1645963843. The next prime is 1645963853. The reversal of 1645963850 is 583695461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 446519161 + 1199444689 = 21131^2 + 34633^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1645963795 and 1645963804.

It is not an unprimeable number, because it can be changed into a prime (1645963853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221825 + ... + 229124.

Almost surely, 2^1645963850 is an apocalyptic number.

1645963850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645963850 is a deficient number, since it is larger than the sum of its proper divisors (1457474050).

1645963850 is a wasteful number, since it uses less digits than its factorization.

1645963850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451034 (or 451029 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 47.

The square root of 1645963850 is about 40570.4800316683. The cubic root of 1645963850 is about 1180.7014526114.

The spelling of 1645963850 in words is "one billion, six hundred forty-five million, nine hundred sixty-three thousand, eight hundred fifty".