645216435 has 40 divisors (see below), whose sum is σ = 1178472240. Its totient is φ = 337611456.

The previous prime is 645216409. The next prime is 645216437. The reversal of 645216435 is 534612546.

645216435 is a `hidden beast` number, since 6 + 4 + 5 + 2 + 1 + 643 + 5 = 666.

It is not a de Polignac number, because 645216435 - 2²² = 641022131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645216435.

It is not an unprimeable number, because it can be changed into a prime (645216437) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6436 + ... + 36494.

It is an arithmetic number, because the mean of its divisors is an integer number (29461806).

Almost surely, 2^645216435 is an apocalyptic number.

645216435 is a deficient number, since it is larger than the sum of its proper divisors (533255805).

645216435 is a wasteful number, since it uses less digits than its factorization.

645216435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30129 (or 30120 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 645216435 is about 25401.1109009035. The cubic root of 645216435 is about 864.1088910790.

The spelling of 645216435 in words is "six hundred forty-five million, two hundred sixteen thousand, four hundred thirty-five".