6785400649 has 2 divisors, whose sum is σ = 6785400650. Its totient is φ = 6785400648.

The previous prime is 6785400641. The next prime is 6785400701. The reversal of 6785400649 is 9460045876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5755953424 + 1029447225 = 75868^2 + 32085^2 .

It is a cyclic number.

It is not a de Polignac number, because 6785400649 - 2³ = 6785400641 is a prime.

It is a super-3 number, since 3×6785400649³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6785400641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3392700324 + 3392700325.

It is an arithmetic number, because the mean of its divisors is an integer number (3392700325).

Almost surely, 2^6785400649 is an apocalyptic number.

It is an amenable number.

6785400649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6785400649 is an equidigital number, since it uses as much as digits as its factorization.

6785400649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 6785400649 is about 82373.5433801412. The cubic root of 6785400649 is about 1893.1796694255.

The spelling of 6785400649 in words is "six billion, seven hundred eighty-five million, four hundred thousand, six hundred forty-nine".