6616948861 has 2 divisors, whose sum is σ = 6616948862. Its totient is φ = 6616948860.

The previous prime is 6616948859. The next prime is 6616948903. The reversal of 6616948861 is 1688496166.

6616948861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4076184025 + 2540764836 = 63845^2 + 50406^2 .

It is a cyclic number.

It is not a de Polignac number, because 6616948861 - 2¹ = 6616948859 is a prime.

Together with 6616948859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6616948061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3308474430 + 3308474431.

It is an arithmetic number, because the mean of its divisors is an integer number (3308474431).

Almost surely, 2^6616948861 is an apocalyptic number.

It is an amenable number.

6616948861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6616948861 is an equidigital number, since it uses as much as digits as its factorization.

6616948861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 55.

The square root of 6616948861 is about 81344.6301915498. The cubic root of 6616948861 is about 1877.3817541456.

The spelling of 6616948861 in words is "six billion, six hundred sixteen million, nine hundred forty-eight thousand, eight hundred sixty-one".