6657416981 has 2 divisors, whose sum is σ = 6657416982. Its totient is φ = 6657416980.

The previous prime is 6657416959. The next prime is 6657417007. The reversal of 6657416981 is 1896147566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382569956 + 1274847025 = 73366^2 + 35705^2 .

It is a cyclic number.

It is not a de Polignac number, because 6657416981 - 2⁶ = 6657416917 is a prime.

It is a super-2 number, since 2×6657416981² = 88642401717814308722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6657416911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328708490 + 3328708491.

It is an arithmetic number, because the mean of its divisors is an integer number (3328708491).

Almost surely, 2^6657416981 is an apocalyptic number.

It is an amenable number.

6657416981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6657416981 is an equidigital number, since it uses as much as digits as its factorization.

6657416981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The square root of 6657416981 is about 81592.9959065115. The cubic root of 6657416981 is about 1881.2012261450.

The spelling of 6657416981 in words is "six billion, six hundred fifty-seven million, four hundred sixteen thousand, nine hundred eighty-one".