66098857761 has 10 divisors (see below), whose sum is σ = 98740269122. Its totient is φ = 44065905120.

The previous prime is 66098857711. The next prime is 66098857801. The reversal of 66098857761 is 16775889066.

66098857761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 65866142736 + 232715025 = 256644^2 + 15255^2 .

It is not a de Polignac number, because 66098857761 - 2⁷ = 66098857633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66098857711) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 408017560 + ... + 408017721.

Almost surely, 2^66098857761 is an apocalyptic number.

It is an amenable number.

66098857761 is a deficient number, since it is larger than the sum of its proper divisors (32641411361).

66098857761 is an equidigital number, since it uses as much as digits as its factorization.

66098857761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816035293 (or 816035284 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 66098857761 in words is "sixty-six billion, ninety-eight million, eight hundred fifty-seven thousand, seven hundred sixty-one".