633815215921969 has 3 divisors (see below), whose sum is σ = 633815241097657. Its totient is φ = 633815190746282.

The previous prime is 633815215921963. The next prime is 633815215922029. The reversal of 633815215921969 is 969129512518336.

The square root of 633815215921969 is 25175687.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 633815215921969 - 2³ = 633815215921961 is a prime.

It is a super-2 number, since 2×633815215921969² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 633815215921898 and 633815215921907.

It is not an unprimeable number, because it can be changed into a prime (633815215921961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12587844 + ... + 37763530.

Almost surely, 2^{633815215921969} is an apocalyptic number.

633815215921969 is the 25175687-th square number.

633815215921969 is the 12587844-th centered octagonal number.

It is an amenable number.

633815215921969 is a deficient number, since it is larger than the sum of its proper divisors (25175688).

633815215921969 is an frugal number, since it uses more digits than its factorization.

633815215921969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50351374 (or 25175687 counting only the distinct ones).

The product of its digits is 188956800, while the sum is 70.

The spelling of 633815215921969 in words is "six hundred thirty-three trillion, eight hundred fifteen billion, two hundred fifteen million, nine hundred twenty-one thousand, nine hundred sixty-nine".