1645060100 has 18 divisors (see below), whose sum is σ = 3569780634. Its totient is φ = 658024000.

The previous prime is 1645060099. The next prime is 1645060133. The reversal of 1645060100 is 10605461.

It can be written as a sum of positive squares in 3 ways, for example, as 515562436 + 1129497664 = 22706^2 + 33608^2 .

It is a super-2 number, since 2×1645060100² = 5412445465224020000, which contains 22 as substring.

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, 8225201 + ... + 8225400.

Almost surely, 2^1645060100 is an apocalyptic number.

1645060100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645060100 is an abundant number, since it is smaller than the sum of its proper divisors (1924720534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645060100 is a wasteful number, since it uses less digits than its factorization.

1645060100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16450615 (or 16450608 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1645060100 is about 40559.3404778727. The cubic root of 1645060100 is about 1180.4853169828.

Adding to 1645060100 its reverse (10605461), we get a palindrome (1655665561).

The spelling of 1645060100 in words is "one billion, six hundred forty-five million, sixty thousand, one hundred".