646215053 has 8 divisors (see below), whose sum is σ = 714619776. Its totient is φ = 579420000.

The previous prime is 646215047. The next prime is 646215071. The reversal of 646215053 is 350512646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646215053 - 2¹⁴ = 646198669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646215013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401573 + ... + 403178.

It is an arithmetic number, because the mean of its divisors is an integer number (89327472).

Almost surely, 2^646215053 is an apocalyptic number.

It is an amenable number.

646215053 is a deficient number, since it is larger than the sum of its proper divisors (68404723).

646215053 is a wasteful number, since it uses less digits than its factorization.

646215053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804835.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 646215053 is about 25420.7602758061. The cubic root of 646215053 is about 864.5544624372.

Adding to 646215053 its reverse (350512646), we get a palindrome (996727699).

The spelling of 646215053 in words is "six hundred forty-six million, two hundred fifteen thousand, fifty-three".