6777220545 has 24 divisors (see below), whose sum is σ = 11755014336. Its totient is φ = 3612107808.

The previous prime is 6777220543. The next prime is 6777220577. The reversal of 6777220545 is 5450227776.

It is not a de Polignac number, because 6777220545 - 2¹ = 6777220543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6777220545.

It is not an unprimeable number, because it can be changed into a prime (6777220543) 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 23 ways as a sum of consecutive naturals, for example, 19092 + ... + 117978.

It is an arithmetic number, because the mean of its divisors is an integer number (489792264).

Almost surely, 2^6777220545 is an apocalyptic number.

It is an amenable number.

6777220545 is a deficient number, since it is larger than the sum of its proper divisors (4977793791).

6777220545 is a wasteful number, since it uses less digits than its factorization.

6777220545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100421 (or 100418 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 45.

The square root of 6777220545 is about 82323.8759109409. The cubic root of 6777220545 is about 1892.4185925811.

The spelling of 6777220545 in words is "six billion, seven hundred seventy-seven million, two hundred twenty thousand, five hundred forty-five".