66158579415708 has 288 divisors, whose sum is σ = 193489819915392. Its totient is φ = 18900054835200.

The previous prime is 66158579415701. The next prime is 66158579415769. The reversal of 66158579415708 is 80751497585166.

66158579415708 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 8 + 5 + 7 + 9 + 41 + 570 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66158579415701) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 86560348 + ... + 87321308.

It is an arithmetic number, because the mean of its divisors is an integer number (671839652484).

Almost surely, 2^{66158579415708} 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 66158579415708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96744909957696).

66158579415708 is an abundant number, since it is smaller than the sum of its proper divisors (127331240499684).

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

66158579415708 is a wasteful number, since it uses less digits than its factorization.

66158579415708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761245 (or 761240 counting only the distinct ones).

The product of its (nonzero) digits is 508032000, while the sum is 72.

The spelling of 66158579415708 in words is "sixty-six trillion, one hundred fifty-eight billion, five hundred seventy-nine million, four hundred fifteen thousand, seven hundred eight".