646523655451403 has 16 divisors (see below), whose sum is σ = 691761022514496. Its totient is φ = 602893024419840.

The previous prime is 646523655451397. The next prime is 646523655451417. The reversal of 646523655451403 is 304154556325646.

It is a cyclic number.

It is not a de Polignac number, because 646523655451403 - 2⁸ = 646523655451147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646523655451493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2038846550 + ... + 2039163627.

It is an arithmetic number, because the mean of its divisors is an integer number (43235063907156).

Almost surely, 2^{646523655451403} is an apocalyptic number.

646523655451403 is a deficient number, since it is larger than the sum of its proper divisors (45237367063093).

646523655451403 is a wasteful number, since it uses less digits than its factorization.

646523655451403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078010374.

The product of its (nonzero) digits is 155520000, while the sum is 59.

The spelling of 646523655451403 in words is "six hundred forty-six trillion, five hundred twenty-three billion, six hundred fifty-five million, four hundred fifty-one thousand, four hundred three".