646216533352621 has 32 divisors (see below), whose sum is σ = 827662263291648. Its totient is φ = 489808851517440.

The previous prime is 646216533352483. The next prime is 646216533352661. The reversal of 646216533352621 is 126253335612646.

It is not a de Polignac number, because 646216533352621 - 2⁹ = 646216533352109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646216533352661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18457300 + ... + 40411693.

It is an arithmetic number, because the mean of its divisors is an integer number (25864445727864).

Almost surely, 2^{646216533352621} is an apocalyptic number.

It is an amenable number.

646216533352621 is a deficient number, since it is larger than the sum of its proper divisors (181445729939027).

646216533352621 is a wasteful number, since it uses less digits than its factorization.

646216533352621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58872901.

The product of its digits is 27993600, while the sum is 55.

The spelling of 646216533352621 in words is "six hundred forty-six trillion, two hundred sixteen billion, five hundred thirty-three million, three hundred fifty-two thousand, six hundred twenty-one".