66541367550 has 96 divisors (see below), whose sum is σ = 189349380864. Its totient is φ = 15148800000.

The previous prime is 66541367549. The next prime is 66541367569. The reversal of 66541367550 is 5576314566.

It is a self number, because there is not a number n which added to its sum of digits gives 66541367550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137310 + ... + 389790.

It is an arithmetic number, because the mean of its divisors is an integer number (1972389384).

Almost surely, 2^66541367550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66541367550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94674690432).

66541367550 is an abundant number, since it is smaller than the sum of its proper divisors (122808013314).

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

66541367550 is a wasteful number, since it uses less digits than its factorization.

66541367550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252754 (or 252749 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 66541367550 in words is "sixty-six billion, five hundred forty-one million, three hundred sixty-seven thousand, five hundred fifty".