1645011222 has 64 divisors (see below), whose sum is σ = 3683646720. Its totient is φ = 486687744.

The previous prime is 1645011211. The next prime is 1645011223. The reversal of 1645011222 is 2221105461.

It is a junction number, because it is equal to n+sod(n) for n = 1645011192 and 1645011201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645011223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449733 + ... + 453375.

It is an arithmetic number, because the mean of its divisors is an integer number (57556980).

Almost surely, 2^1645011222 is an apocalyptic number.

1645011222 is an abundant number, since it is smaller than the sum of its proper divisors (2038635498).

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

1645011222 is a wasteful number, since it uses less digits than its factorization.

1645011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3917.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1645011222 is about 40558.7379241514. The cubic root of 1645011222 is about 1180.4736253465.

Adding to 1645011222 its reverse (2221105461), we get a palindrome (3866116683).

It can be divided in two parts, 16450 and 11222, that added together give a palindrome (27672).

The spelling of 1645011222 in words is "one billion, six hundred forty-five million, eleven thousand, two hundred twenty-two".