66535197243606 has 192 divisors, whose sum is σ = 183705513546240. Its totient is φ = 17477828784000.

The previous prime is 66535197243527. The next prime is 66535197243631. The reversal of 66535197243606 is 60634279153566.

66535197243606 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 5 + 19 + 7 + 2 + 4 + 3 + 606 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13959616 + ... + 18109148.

It is an arithmetic number, because the mean of its divisors is an integer number (956799549720).

Almost surely, 2^{66535197243606} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66535197243606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91852756773120).

66535197243606 is an abundant number, since it is smaller than the sum of its proper divisors (117170316302634).

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

66535197243606 is a wasteful number, since it uses less digits than its factorization.

66535197243606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149828 (or 4149809 counting only the distinct ones).

The product of its (nonzero) digits is 146966400, while the sum is 63.

The spelling of 66535197243606 in words is "sixty-six trillion, five hundred thirty-five billion, one hundred ninety-seven million, two hundred forty-three thousand, six hundred six".