646352253646 has 8 divisors (see below), whose sum is σ = 1057667324184. Its totient is φ = 293796478920.

The previous prime is 646352253571. The next prime is 646352253647.

646352253646 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 646352253593 and 646352253602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646352253647) 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, 14689823925 + ... + 14689823968.

It is an arithmetic number, because the mean of its divisors is an integer number (132208415523).

Almost surely, 2^646352253646 is an apocalyptic number.

646352253646 is a deficient number, since it is larger than the sum of its proper divisors (411315070538).

646352253646 is a wasteful number, since it uses less digits than its factorization.

646352253646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29379647906.

The product of its digits is 18662400, while the sum is 52.

It can be divided in two parts, 646352 and 253646, that added together give a palindrome (899998).

The spelling of 646352253646 in words is "six hundred forty-six billion, three hundred fifty-two million, two hundred fifty-three thousand, six hundred forty-six".