633231255551 has 4 divisors (see below), whose sum is σ = 633580915704. Its totient is φ = 632881595400.

The previous prime is 633231255541. The next prime is 633231255563. The reversal of 633231255551 is 155552132336.

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

It is a cyclic number.

It is not a de Polignac number, because 633231255551 - 2⁶ = 633231255487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 633231255499 and 633231255508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633231255541) 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, 174827360 + ... + 174830981.

It is an arithmetic number, because the mean of its divisors is an integer number (158395228926).

Almost surely, 2^633231255551 is an apocalyptic number.

633231255551 is a deficient number, since it is larger than the sum of its proper divisors (349660153).

633231255551 is a wasteful number, since it uses less digits than its factorization.

633231255551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349660152.

The product of its digits is 405000, while the sum is 41.

Adding to 633231255551 its reverse (155552132336), we get a palindrome (788783387887).

The spelling of 633231255551 in words is "six hundred thirty-three billion, two hundred thirty-one million, two hundred fifty-five thousand, five hundred fifty-one".