66137739136 has 128 divisors (see below), whose sum is σ = 155869839360. Its totient is φ = 27354378240.

The previous prime is 66137739127. The next prime is 66137739137. The reversal of 66137739136 is 63193773166.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137739137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10635100 + ... + 10641316.

It is an arithmetic number, because the mean of its divisors is an integer number (1217733120).

Almost surely, 2^66137739136 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 66137739136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77934919680).

66137739136 is an abundant number, since it is smaller than the sum of its proper divisors (89732100224).

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

66137739136 is a wasteful number, since it uses less digits than its factorization.

66137739136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6652 (or 6640 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 52.

The spelling of 66137739136 in words is "sixty-six billion, one hundred thirty-seven million, seven hundred thirty-nine thousand, one hundred thirty-six".