2666442651 has 4 divisors (see below), whose sum is σ = 3555256872. Its totient is φ = 1777628432.

The previous prime is 2666442607. The next prime is 2666442677. The reversal of 2666442651 is 1562446662.

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 2666442651 - 2⁹ = 2666442139 is a prime.

It is a super-2 number, since 2×2666442651² = 14219832822143815602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2666462651) 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, 444407106 + ... + 444407111.

It is an arithmetic number, because the mean of its divisors is an integer number (888814218).

Almost surely, 2^2666442651 is an apocalyptic number.

2666442651 is a deficient number, since it is larger than the sum of its proper divisors (888814221).

2666442651 is an equidigital number, since it uses as much as digits as its factorization.

2666442651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888814220.

The product of its digits is 414720, while the sum is 42.

The square root of 2666442651 is about 51637.6088815119. The cubic root of 2666442651 is about 1386.6837166668.

The spelling of 2666442651 in words is "two billion, six hundred sixty-six million, four hundred forty-two thousand, six hundred fifty-one".