6780401266 has 4 divisors (see below), whose sum is σ = 10170601902. Its totient is φ = 3390200632.

The previous prime is 6780401249. The next prime is 6780401267. The reversal of 6780401266 is 6621040876.

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

It can be written as a sum of positive squares in only one way, i.e., 6325816225 + 454585041 = 79535^2 + 21321^2 .

It is not an unprimeable number, because it can be changed into a prime (6780401267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1695100315 + ... + 1695100318.

Almost surely, 2^6780401266 is an apocalyptic number.

6780401266 is a deficient number, since it is larger than the sum of its proper divisors (3390200636).

6780401266 is a wasteful number, since it uses less digits than its factorization.

6780401266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390200635.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 6780401266 is about 82343.1919833085. The cubic root of 6780401266 is about 1892.7145995798.

The spelling of 6780401266 in words is "six billion, seven hundred eighty million, four hundred one thousand, two hundred sixty-six".