646521252201215 has 8 divisors (see below), whose sum is σ = 775825814594880. Its totient is φ = 517216793792032.

The previous prime is 646521252201109. The next prime is 646521252201233. The reversal of 646521252201215 is 512102252125646.

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 646521252201215 - 2¹⁸ = 646521251939071 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11592119 + ... + 37781208.

It is an arithmetic number, because the mean of its divisors is an integer number (96978226824360).

Almost surely, 2^{646521252201215} is an apocalyptic number.

646521252201215 is a deficient number, since it is larger than the sum of its proper divisors (129304562393665).

646521252201215 is a wasteful number, since it uses less digits than its factorization.

646521252201215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51992241.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 646521252201215 in words is "six hundred forty-six trillion, five hundred twenty-one billion, two hundred fifty-two million, two hundred one thousand, two hundred fifteen".