645564214 has 4 divisors (see below), whose sum is σ = 968346324. Its totient is φ = 322782106.

The previous prime is 645564169. The next prime is 645564217. The reversal of 645564214 is 412465546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645564217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161391052 + ... + 161391055.

It is an arithmetic number, because the mean of its divisors is an integer number (242086581).

Almost surely, 2^645564214 is an apocalyptic number.

645564214 is a deficient number, since it is larger than the sum of its proper divisors (322782110).

645564214 is a wasteful number, since it uses less digits than its factorization.

645564214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322782109.

The product of its digits is 115200, while the sum is 37.

The square root of 645564214 is about 25407.9557225685. The cubic root of 645564214 is about 864.2641180341.

The spelling of 645564214 in words is "six hundred forty-five million, five hundred sixty-four thousand, two hundred fourteen".