646216521651356 has 12 divisors (see below), whose sum is σ = 1138468704252600. Its totient is φ = 320939749007760.

The previous prime is 646216521651341. The next prime is 646216521651373. The reversal of 646216521651356 is 653156125612646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646216521651295 and 646216521651304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542127953810 + ... + 542127955001.

It is an arithmetic number, because the mean of its divisors is an integer number (94872392021050).

Almost surely, 2^{646216521651356} is an apocalyptic number.

It is an amenable number.

646216521651356 is a deficient number, since it is larger than the sum of its proper divisors (492252182601244).

646216521651356 is a wasteful number, since it uses less digits than its factorization.

646216521651356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084255908964 (or 1084255908962 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 59.

The spelling of 646216521651356 in words is "six hundred forty-six trillion, two hundred sixteen billion, five hundred twenty-one million, six hundred fifty-one thousand, three hundred fifty-six".