669278011 has 4 divisors (see below), whose sum is σ = 681905952. Its totient is φ = 656650072.

The previous prime is 669277997. The next prime is 669278023. The reversal of 669278011 is 110872966.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 669278011 - 2⁷ = 669277883 is a prime.

It is a super-2 number, since 2×669278011² = 895866112016232242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669278041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6313891 + ... + 6313996.

It is an arithmetic number, because the mean of its divisors is an integer number (170476488).

Almost surely, 2^669278011 is an apocalyptic number.

669278011 is a deficient number, since it is larger than the sum of its proper divisors (12627941).

669278011 is a wasteful number, since it uses less digits than its factorization.

669278011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12627940.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 669278011 is about 25870.4080176560. The cubic root of 669278011 is about 874.7195884045.

The spelling of 669278011 in words is "six hundred sixty-nine million, two hundred seventy-eight thousand, eleven".