1645115650 has 12 divisors (see below), whose sum is σ = 3059915202. Its totient is φ = 658046240.

The previous prime is 1645115639. The next prime is 1645115669. The reversal of 1645115650 is 565115461.

It can be written as a sum of positive squares in 3 ways, for example, as 1335390849 + 309724801 = 36543^2 + 17599^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16451107 + ... + 16451206.

Almost surely, 2^1645115650 is an apocalyptic number.

1645115650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645115650 is a deficient number, since it is larger than the sum of its proper divisors (1414799552).

1645115650 is a wasteful number, since it uses less digits than its factorization.

1645115650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32902325 (or 32902320 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1645115650 is about 40560.0252711953. The cubic root of 1645115650 is about 1180.4986042828.

The spelling of 1645115650 in words is "one billion, six hundred forty-five million, one hundred fifteen thousand, six hundred fifty".