66503757737340 has 1296 divisors, whose sum is σ = 268435826227296. Its totient is φ = 13770050595840.

The previous prime is 66503757737311. The next prime is 66503757737371. The reversal of 66503757737340 is 4373775730566.

66503757737340 is a `hidden beast` number, since 6 + 6 + 50 + 3 + 7 + 577 + 3 + 7 + 3 + 4 + 0 = 666.

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 431 ways as a sum of consecutive naturals, for example, 8442773482 + ... + 8442781358.

It is an arithmetic number, because the mean of its divisors is an integer number (207126409126).

Almost surely, 2^{66503757737340} is an apocalyptic number.

66503757737340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66503757737340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134217913113648).

66503757737340 is an abundant number, since it is smaller than the sum of its proper divisors (201932068489956).

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

66503757737340 is a wasteful number, since it uses less digits than its factorization.

66503757737340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8230 (or 8198 counting only the distinct ones).

The product of its (nonzero) digits is 233377200, while the sum is 63.

The spelling of 66503757737340 in words is "sixty-six trillion, five hundred three billion, seven hundred fifty-seven million, seven hundred thirty-seven thousand, three hundred forty".