1645222145 has 8 divisors (see below), whose sum is σ = 2256304704. Its totient is φ = 1128152304.

The previous prime is 1645222133. The next prime is 1645222147. The reversal of 1645222145 is 5412225461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645222145 - 2¹² = 1645218049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645222147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23503139 + ... + 23503208.

It is an arithmetic number, because the mean of its divisors is an integer number (282038088).

Almost surely, 2^1645222145 is an apocalyptic number.

It is an amenable number.

1645222145 is a deficient number, since it is larger than the sum of its proper divisors (611082559).

1645222145 is an equidigital number, since it uses as much as digits as its factorization.

1645222145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47006359.

The product of its digits is 19200, while the sum is 32.

The square root of 1645222145 is about 40561.3380573176. The cubic root of 1645222145 is about 1180.5240765520.

The spelling of 1645222145 in words is "one billion, six hundred forty-five million, two hundred twenty-two thousand, one hundred forty-five".