66437859312 has 320 divisors, whose sum is σ = 215391928320. Its totient is φ = 19424966400.

The previous prime is 66437859259. The next prime is 66437859391. The reversal of 66437859312 is 21395873466.

66437859312 is a `hidden beast` number, since 6 + 6 + 4 + 37 + 8 + 593 + 12 = 666.

It is a super-2 number, since 2×66437859312² (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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89418013 + ... + 89418755.

It is an arithmetic number, because the mean of its divisors is an integer number (673099776).

Almost surely, 2^66437859312 is an apocalyptic number.

66437859312 is a gapful number since it is divisible by the number (62) 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 66437859312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107695964160).

66437859312 is an abundant number, since it is smaller than the sum of its proper divisors (148954069008).

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

66437859312 is a wasteful number, since it uses less digits than its factorization.

66437859312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1397 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 66437859312 in words is "sixty-six billion, four hundred thirty-seven million, eight hundred fifty-nine thousand, three hundred twelve".