645214451053 has 4 divisors (see below), whose sum is σ = 645237023068. Its totient is φ = 645191879040.

The previous prime is 645214451039. The next prime is 645214451081. The reversal of 645214451053 is 350154412546.

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

It can be written as a sum of positive squares in 2 ways, for example, as 253635118884 + 391579332169 = 503622^2 + 625763^2 .

It is a cyclic number.

It is not a de Polignac number, because 645214451053 - 2³³ = 636624516461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645214450997 and 645214451015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645214451033) 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, 11243076 + ... + 11300317.

It is an arithmetic number, because the mean of its divisors is an integer number (161309255767).

Almost surely, 2^645214451053 is an apocalyptic number.

It is an amenable number.

645214451053 is a deficient number, since it is larger than the sum of its proper divisors (22572015).

645214451053 is a wasteful number, since it uses less digits than its factorization.

645214451053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22572014.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 645214451053 its reverse (350154412546), we get a palindrome (995368863599).

The spelling of 645214451053 in words is "six hundred forty-five billion, two hundred fourteen million, four hundred fifty-one thousand, fifty-three".