6371777778 has 8 divisors (see below), whose sum is σ = 12743555568. Its totient is φ = 2123925924.

The previous prime is 6371777777. The next prime is 6371777857. The reversal of 6371777778 is 8777771736.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

6371777778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (6371777773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530981476 + ... + 530981487.

It is an arithmetic number, because the mean of its divisors is an integer number (1592944446).

Almost surely, 2^6371777778 is an apocalyptic number.

6371777778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6371777778 is a wasteful number, since it uses less digits than its factorization.

6371777778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061962968.

The product of its digits is 16941456, while the sum is 60.

The square root of 6371777778 is about 79823.4162260674. The cubic root of 6371777778 is about 1853.9024297883.

The spelling of 6371777778 in words is "six billion, three hundred seventy-one million, seven hundred seventy-seven thousand, seven hundred seventy-eight".