645814419 has 4 divisors (see below), whose sum is σ = 861085896. Its totient is φ = 430542944.

The previous prime is 645814417. The next prime is 645814453. The reversal of 645814419 is 914418546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645814419 - 2¹ = 645814417 is a prime.

It is a super-2 number, since 2×645814419² = 834152527576615122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645814417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107635734 + ... + 107635739.

It is an arithmetic number, because the mean of its divisors is an integer number (215271474).

Almost surely, 2^645814419 is an apocalyptic number.

645814419 is a deficient number, since it is larger than the sum of its proper divisors (215271477).

645814419 is a wasteful number, since it uses less digits than its factorization.

645814419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215271476.

The product of its digits is 138240, while the sum is 42.

The square root of 645814419 is about 25412.8789986495. The cubic root of 645814419 is about 864.3757595347.

The spelling of 645814419 in words is "six hundred forty-five million, eight hundred fourteen thousand, four hundred nineteen".