66098204991 has 288 divisors, whose sum is σ = 128382259200. Its totient is φ = 32691859200.

The previous prime is 66098204987. The next prime is 66098205031. The reversal of 66098204991 is 19940289066.

66098204991 is a `hidden beast` number, since 6 + 60 + 98 + 2 + 0 + 499 + 1 = 666.

It is not a de Polignac number, because 66098204991 - 2² = 66098204987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66098204911) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 986540340 + ... + 986540406.

Almost surely, 2^66098204991 is an apocalyptic number.

66098204991 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66098204991 is a deficient number, since it is larger than the sum of its proper divisors (62284054209).

66098204991 is a wasteful number, since it uses less digits than its factorization.

66098204991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 66098204991 in words is "sixty-six billion, ninety-eight million, two hundred four thousand, nine hundred ninety-one".