6666642051 has 8 divisors (see below), whose sum is σ = 8890617024. Its totient is φ = 4443547560.

The previous prime is 6666642049. The next prime is 6666642071. The reversal of 6666642051 is 1502466666.

It is a happy number.

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

It is not a de Polignac number, because 6666642051 - 2¹ = 6666642049 is a prime.

It is a super-2 number, since 2×6666642051² = 88888232472322973202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6666641994 and 6666642012.

It is not an unprimeable number, because it can be changed into a prime (6666642001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202245 + ... + 232886.

It is an arithmetic number, because the mean of its divisors is an integer number (1111327128).

Almost surely, 2^6666642051 is an apocalyptic number.

6666642051 is a deficient number, since it is larger than the sum of its proper divisors (2223974973).

6666642051 is a wasteful number, since it uses less digits than its factorization.

6666642051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440241.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 6666642051 is about 81649.5073530759. The cubic root of 6666642051 is about 1882.0697413363.

The spelling of 6666642051 in words is "six billion, six hundred sixty-six million, six hundred forty-two thousand, fifty-one".