6551778377 has 8 divisors (see below), whose sum is σ = 6714797760. Its totient is φ = 6389243280.

The previous prime is 6551778371. The next prime is 6551778391. The reversal of 6551778377 is 7738771556.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6551778377 - 2¹⁸ = 6551516233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6551778371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93602 + ... + 147867.

It is an arithmetic number, because the mean of its divisors is an integer number (839349720).

Almost surely, 2^6551778377 is an apocalyptic number.

It is an amenable number.

6551778377 is a deficient number, since it is larger than the sum of its proper divisors (163019383).

6551778377 is a wasteful number, since it uses less digits than its factorization.

6551778377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242143.

The product of its digits is 8643600, while the sum is 56.

The square root of 6551778377 is about 80943.0563853380. The cubic root of 6551778377 is about 1871.1979490855.

The spelling of 6551778377 in words is "six billion, five hundred fifty-one million, seven hundred seventy-eight thousand, three hundred seventy-seven".