66463726109040 has 320 divisors, whose sum is σ = 247102301107200. Its totient is φ = 16323031581696.

The previous prime is 66463726109023. The next prime is 66463726109083. The reversal of 66463726109040 is 4090162736466.

It is a happy number.

66463726109040 is a `hidden beast` number, since 6 + 6 + 463 + 72 + 6 + 109 + 0 + 4 + 0 = 666.

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 63 ways as a sum of consecutive naturals, for example, 9631287 + ... + 15022953.

It is an arithmetic number, because the mean of its divisors is an integer number (772194690960).

Almost surely, 2^{66463726109040} is an apocalyptic number.

66463726109040 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 66463726109040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123551150553600).

66463726109040 is an abundant number, since it is smaller than the sum of its proper divisors (180638574998160).

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

66463726109040 is a wasteful number, since it uses less digits than its factorization.

66463726109040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392141 (or 5392129 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 66463726109040 in words is "sixty-six trillion, four hundred sixty-three billion, seven hundred twenty-six million, one hundred nine thousand, forty".