6635912645 has 8 divisors (see below), whose sum is σ = 7963610904. Its totient is φ = 5308386304.

The previous prime is 6635912611. The next prime is 6635912671. The reversal of 6635912645 is 5462195366.

It can be written as a sum of positive squares in 4 ways, for example, as 1532096164 + 5103816481 = 39142^2 + 71441^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6635912645 - 2²⁰ = 6634864069 is a prime.

It is a super-3 number, since 3×6635912645³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6635912645.

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, 67997 + ... + 133773.

It is an arithmetic number, because the mean of its divisors is an integer number (995451363).

Almost surely, 2^6635912645 is an apocalyptic number.

It is an amenable number.

6635912645 is a deficient number, since it is larger than the sum of its proper divisors (1327698259).

6635912645 is a wasteful number, since it uses less digits than its factorization.

6635912645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85959.

The product of its digits is 1166400, while the sum is 47.

The square root of 6635912645 is about 81461.1112433411. Note that the first 3 decimals coincide. The cubic root of 6635912645 is about 1879.1735318739.

The spelling of 6635912645 in words is "six billion, six hundred thirty-five million, nine hundred twelve thousand, six hundred forty-five".