6641663051 has 4 divisors (see below), whose sum is σ = 6678357504. Its totient is φ = 6604968600.

The previous prime is 6641663029. The next prime is 6641663053. The reversal of 6641663051 is 1503661466.

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 6641663051 - 2¹⁸ = 6641400907 is a prime.

It is a super-2 number, since 2×6641663051² = 88223376166037257202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6641662996 and 6641663014.

It is not an unprimeable number, because it can be changed into a prime (6641663053) 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, 18346955 + ... + 18347316.

It is an arithmetic number, because the mean of its divisors is an integer number (1669589376).

Almost surely, 2^6641663051 is an apocalyptic number.

6641663051 is a deficient number, since it is larger than the sum of its proper divisors (36694453).

6641663051 is a wasteful number, since it uses less digits than its factorization.

6641663051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36694452.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 6641663051 is about 81496.3990063365. The cubic root of 6641663051 is about 1879.7161797098.

The spelling of 6641663051 in words is "six billion, six hundred forty-one million, six hundred sixty-three thousand, fifty-one".