66158616601 has 12 divisors (see below), whose sum is σ = 83956389840. Its totient is φ = 51552168360.

The previous prime is 66158616599. The next prime is 66158616631. The reversal of 66158616601 is 10661685166.

66158616601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66158616601 - 2¹ = 66158616599 is a prime.

It is a super-2 number, since 2×66158616601² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66158616631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61371091 + ... + 61372168.

It is an arithmetic number, because the mean of its divisors is an integer number (6996365820).

Almost surely, 2^66158616601 is an apocalyptic number.

It is an amenable number.

66158616601 is a deficient number, since it is larger than the sum of its proper divisors (17797773239).

66158616601 is a wasteful number, since it uses less digits than its factorization.

66158616601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122743284 (or 122743277 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 66158616601 in words is "sixty-six billion, one hundred fifty-eight million, six hundred sixteen thousand, six hundred one".