66235291488 has 144 divisors (see below), whose sum is σ = 199876412736. Its totient is φ = 21564869760.

The previous prime is 66235291471. The next prime is 66235291513. The reversal of 66235291488 is 88419253266.

66235291488 is a `hidden beast` number, since 6 + 6 + 23 + 52 + 91 + 488 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×66235291488² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235323 + ... + 433413.

It is an arithmetic number, because the mean of its divisors is an integer number (1388030644).

Almost surely, 2^66235291488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66235291488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99938206368).

66235291488 is an abundant number, since it is smaller than the sum of its proper divisors (133641121248).

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

66235291488 is a wasteful number, since it uses less digits than its factorization.

66235291488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198159 (or 198139 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 66235291488 in words is "sixty-six billion, two hundred thirty-five million, two hundred ninety-one thousand, four hundred eighty-eight".