6660918477641 has 2 divisors, whose sum is σ = 6660918477642. Its totient is φ = 6660918477640.

The previous prime is 6660918477589. The next prime is 6660918477667. The reversal of 6660918477641 is 1467748190666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5362948166416 + 1297970311225 = 2315804^2 + 1139285^2 .

It is a cyclic number.

It is not a de Polignac number, because 6660918477641 - 2¹⁴ = 6660918461257 is a prime.

It is a super-4 number, since 4×6660918477641⁴ (a number of 52 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (6660918417641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330459238820 + 3330459238821.

It is an arithmetic number, because the mean of its divisors is an integer number (3330459238821).

Almost surely, 2^{6660918477641} is an apocalyptic number.

It is an amenable number.

6660918477641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660918477641 is an equidigital number, since it uses as much as digits as its factorization.

6660918477641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73156608, while the sum is 65.

The spelling of 6660918477641 in words is "six trillion, six hundred sixty billion, nine hundred eighteen million, four hundred seventy-seven thousand, six hundred forty-one".