7781221063 has 16 divisors (see below), whose sum is σ = 9706185216. Its totient is φ = 6060212640.

The previous prime is 7781221013. The next prime is 7781221081. The reversal of 7781221063 is 3601221877.

It is a cyclic number.

It is not a de Polignac number, because 7781221063 - 2¹³ = 7781212871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7781221013) 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 15 ways as a sum of consecutive naturals, for example, 133470 + ... + 182692.

It is an arithmetic number, because the mean of its divisors is an integer number (606636576).

Almost surely, 2^7781221063 is an apocalyptic number.

7781221063 is a deficient number, since it is larger than the sum of its proper divisors (1924964153).

7781221063 is a wasteful number, since it uses less digits than its factorization.

7781221063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51294.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 7781221063 is about 88211.2298009726. The cubic root of 7781221063 is about 1981.5996547180.

The spelling of 7781221063 in words is "seven billion, seven hundred eighty-one million, two hundred twenty-one thousand, sixty-three".