66720252198 has 16 divisors (see below), whose sum is σ = 136279664640. Its totient is φ = 21766890696.

The previous prime is 66720252197. The next prime is 66720252211. The reversal of 66720252198 is 89125202766.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66720252191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118298038 + ... + 118298601.

It is an arithmetic number, because the mean of its divisors is an integer number (8517479040).

Almost surely, 2^66720252198 is an apocalyptic number.

66720252198 is an abundant number, since it is smaller than the sum of its proper divisors (69559412442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66720252198 is a wasteful number, since it uses less digits than its factorization.

66720252198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236596691.

The product of its (nonzero) digits is 725760, while the sum is 48.

It can be divided in two parts, 667202 and 52198, that added together give a triangular number (719400 = T₁₁₉₉).

The spelling of 66720252198 in words is "sixty-six billion, seven hundred twenty million, two hundred fifty-two thousand, one hundred ninety-eight".