642553355246 has 16 divisors (see below), whose sum is σ = 1097166204288. Its totient is φ = 279371023800.

The previous prime is 642553355239. The next prime is 642553355333.

It is a happy number.

642553355246 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642553355194 and 642553355203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634933640 + ... + 634934651.

It is an arithmetic number, because the mean of its divisors is an integer number (68572887768).

Almost surely, 2^642553355246 is an apocalyptic number.

642553355246 is a deficient number, since it is larger than the sum of its proper divisors (454612849042).

642553355246 is a wasteful number, since it uses less digits than its factorization.

642553355246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269868327.

The product of its digits is 12960000, while the sum is 50.

It can be divided in two parts, 642553 and 355246, that added together give a palindrome (997799).

The spelling of 642553355246 in words is "six hundred forty-two billion, five hundred fifty-three million, three hundred fifty-five thousand, two hundred forty-six".