66158547156 has 144 divisors (see below), whose sum is σ = 190309916160. Its totient is φ = 19224691200.

The previous prime is 66158547139. The next prime is 66158547163. The reversal of 66158547156 is 65174585166.

66158547156 is a `hidden beast` number, since 6 + 6 + 1 + 585 + 4 + 7 + 1 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 811456 + ... + 889256.

It is an arithmetic number, because the mean of its divisors is an integer number (1321596640).

Almost surely, 2^66158547156 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 66158547156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95154958080).

66158547156 is an abundant number, since it is smaller than the sum of its proper divisors (124151369004).

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

66158547156 is a wasteful number, since it uses less digits than its factorization.

66158547156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77926 (or 77921 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The spelling of 66158547156 in words is "sixty-six billion, one hundred fifty-eight million, five hundred forty-seven thousand, one hundred fifty-six".