66158439453072 has 320 divisors, whose sum is σ = 200056444853760. Its totient is φ = 20892520636416.

The previous prime is 66158439453061. The next prime is 66158439453137. The reversal of 66158439453072 is 27035493485166.

66158439453072 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 8 + 4 + 3 + 94 + 530 + 7 + 2 = 666.

It is a super-2 number, since 2×66158439453072² (a number of 28 digits) contains 22 as substring.

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, 488197228 + ... + 488332724.

It is an arithmetic number, because the mean of its divisors is an integer number (625176390168).

It is a 1-persistent number, because it is pandigital, but 2⋅66158439453072 = 132316878906144 is not.

Almost surely, 2^{66158439453072} 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 66158439453072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100028222426880).

66158439453072 is an abundant number, since it is smaller than the sum of its proper divisors (133898005400688).

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

66158439453072 is a wasteful number, since it uses less digits than its factorization.

66158439453072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136007 (or 135995 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 63.

The spelling of 66158439453072 in words is "sixty-six trillion, one hundred fifty-eight billion, four hundred thirty-nine million, four hundred fifty-three thousand, seventy-two".