6278660669 has 2 divisors, whose sum is σ = 6278660670. Its totient is φ = 6278660668.

The previous prime is 6278660639. The next prime is 6278660693. The reversal of 6278660669 is 9660668726.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6278660644 + 25 = 79238^2 + 5^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6278660669 is a prime.

It is a super-2 number, since 2×6278660669² = 78843159592895055122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6278660639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3139330334 + 3139330335.

It is an arithmetic number, because the mean of its divisors is an integer number (3139330335).

Almost surely, 2^6278660669 is an apocalyptic number.

It is an amenable number.

6278660669 is a deficient number, since it is larger than the sum of its proper divisors (1).

6278660669 is an equidigital number, since it uses as much as digits as its factorization.

6278660669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 56.

The square root of 6278660669 is about 79238.0001577526. Note that the first 3 decimals coincide. The cubic root of 6278660669 is about 1844.8271045354.

The spelling of 6278660669 in words is "six billion, two hundred seventy-eight million, six hundred sixty thousand, six hundred sixty-nine".