646021263501463 has 4 divisors (see below), whose sum is σ = 649630320839640. Its totient is φ = 642412206163288.

The previous prime is 646021263501347. The next prime is 646021263501473. The reversal of 646021263501463 is 364105362120646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646021263501463 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 (646021263501473) 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, 1804528668820 + ... + 1804528669177.

It is an arithmetic number, because the mean of its divisors is an integer number (162407580209910).

Almost surely, 2^{646021263501463} is an apocalyptic number.

646021263501463 is a deficient number, since it is larger than the sum of its proper divisors (3609057338177).

646021263501463 is a wasteful number, since it uses less digits than its factorization.

646021263501463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609057338176.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 646021263501463 in words is "six hundred forty-six trillion, twenty-one billion, two hundred sixty-three million, five hundred one thousand, four hundred sixty-three".