66749962229550 has 288 divisors, whose sum is σ = 194878148714496. Its totient is φ = 16331027328000.

The previous prime is 66749962229507. The next prime is 66749962229551. The reversal of 66749962229550 is 5592226994766.

It is a happy number.

66749962229550 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 9 + 9 + 62 + 2 + 2 + 9 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66749962229551) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 35335515 + ... + 37176585.

It is an arithmetic number, because the mean of its divisors is an integer number (676660238592).

Almost surely, 2^{66749962229550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66749962229550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97439074357248).

66749962229550 is an abundant number, since it is smaller than the sum of its proper divisors (128128186484946).

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

66749962229550 is a wasteful number, since it uses less digits than its factorization.

66749962229550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841256 (or 1841248 counting only the distinct ones).

The product of its (nonzero) digits is 881798400, while the sum is 72.

The spelling of 66749962229550 in words is "sixty-six trillion, seven hundred forty-nine billion, nine hundred sixty-two million, two hundred twenty-nine thousand, five hundred fifty".