7778556441 has 10 divisors (see below), whose sum is σ = 11619819002. Its totient is φ = 5185704240.

The previous prime is 7778556389. The next prime is 7778556451. The reversal of 7778556441 is 1446558777.

7778556441 is a `hidden beast` number, since 7 + 7 + 78 + 5 + 564 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7747520400 + 31036041 = 88020^2 + 5571^2 .

It is not a de Polignac number, because 7778556441 - 2¹¹ = 7778554393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7778556451) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 48015700 + ... + 48015861.

Almost surely, 2^7778556441 is an apocalyptic number.

It is an amenable number.

7778556441 is a deficient number, since it is larger than the sum of its proper divisors (3841262561).

7778556441 is an equidigital number, since it uses as much as digits as its factorization.

7778556441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96031573 (or 96031564 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 54.

The square root of 7778556441 is about 88196.1248638510. The cubic root of 7778556441 is about 1981.3734341445.

The spelling of 7778556441 in words is "seven billion, seven hundred seventy-eight million, five hundred fifty-six thousand, four hundred forty-one".