6777610638 has 16 divisors (see below), whose sum is σ = 13810980816. Its totient is φ = 2216576960.

The previous prime is 6777610633. The next prime is 6777610649. The reversal of 6777610638 is 8360167776.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6777610633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10656303 + ... + 10656938.

It is an arithmetic number, because the mean of its divisors is an integer number (863186301).

Almost surely, 2^6777610638 is an apocalyptic number.

6777610638 is an abundant number, since it is smaller than the sum of its proper divisors (7033370178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6777610638 is a wasteful number, since it uses less digits than its factorization.

6777610638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21313299.

The product of its (nonzero) digits is 1778112, while the sum is 51.

The square root of 6777610638 is about 82326.2451348293. The cubic root of 6777610638 is about 1892.4549007341.

The spelling of 6777610638 in words is "six billion, seven hundred seventy-seven million, six hundred ten thousand, six hundred thirty-eight".