1645216067 has 12 divisors (see below), whose sum is σ = 1809717168. Its totient is φ = 1494543600.

The previous prime is 1645216009. The next prime is 1645216117. The reversal of 1645216067 is 7606125461.

It is not a de Polignac number, because 1645216067 - 2²² = 1641021763 is a prime.

It is a super-2 number, since 2×1645216067² = 5413471814229896978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1645216067.

It is not an unprimeable number, because it can be changed into a prime (1645210067) 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, 190217 + ... + 198677.

It is an arithmetic number, because the mean of its divisors is an integer number (150809764).

Almost surely, 2^1645216067 is an apocalyptic number.

1645216067 is a deficient number, since it is larger than the sum of its proper divisors (164501101).

1645216067 is a wasteful number, since it uses less digits than its factorization.

1645216067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10090 (or 10079 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1645216067 is about 40561.2631336846. The cubic root of 1645216067 is about 1180.5226228002.

It can be divided in two parts, 1645 and 216067, that added together give a palindrome (217712).

The spelling of 1645216067 in words is "one billion, six hundred forty-five million, two hundred sixteen thousand, sixty-seven".