66170020587 has 32 divisors (see below), whose sum is σ = 97212234240. Its totient is φ = 39702577920.

The previous prime is 66170020571. The next prime is 66170020603. The reversal of 66170020587 is 78502007166.

66170020587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66170020571) and next prime (66170020603).

It is not a de Polignac number, because 66170020587 - 2⁴ = 66170020571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66170020517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1666714 + ... + 1705952.

It is an arithmetic number, because the mean of its divisors is an integer number (3037882320).

Almost surely, 2^66170020587 is an apocalyptic number.

66170020587 is a deficient number, since it is larger than the sum of its proper divisors (31042213653).

66170020587 is a wasteful number, since it uses less digits than its factorization.

66170020587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39763.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 66170020587 in words is "sixty-six billion, one hundred seventy million, twenty thousand, five hundred eighty-seven".