7720445881 has 2 divisors, whose sum is σ = 7720445882. Its totient is φ = 7720445880.

The previous prime is 7720445861. The next prime is 7720445927. The reversal of 7720445881 is 1885440277.

It is an a-pointer prime, because the next prime (7720445927) can be obtained adding 7720445881 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5876602281 + 1843843600 = 76659^2 + 42940^2 .

It is a cyclic number.

It is not a de Polignac number, because 7720445881 - 2⁷ = 7720445753 is a prime.

It is a super-2 number, since 2×7720445881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7720445851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860222940 + 3860222941.

It is an arithmetic number, because the mean of its divisors is an integer number (3860222941).

Almost surely, 2^7720445881 is an apocalyptic number.

It is an amenable number.

7720445881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7720445881 is an equidigital number, since it uses as much as digits as its factorization.

7720445881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 501760, while the sum is 46.

The square root of 7720445881 is about 87866.0678589864. The cubic root of 7720445881 is about 1976.4270735758.

The spelling of 7720445881 in words is "seven billion, seven hundred twenty million, four hundred forty-five thousand, eight hundred eighty-one".