66155701475 has 48 divisors (see below), whose sum is σ = 87069427200. Its totient is φ = 49723188480.

The previous prime is 66155701471. The next prime is 66155701511. The reversal of 66155701475 is 57410755166.

It is a happy number.

It is not a de Polignac number, because 66155701475 - 2² = 66155701471 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66155701471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51322631 + ... + 51323919.

It is an arithmetic number, because the mean of its divisors is an integer number (1813946400).

Almost surely, 2^66155701475 is an apocalyptic number.

66155701475 is a deficient number, since it is larger than the sum of its proper divisors (20913725725).

66155701475 is a wasteful number, since it uses less digits than its factorization.

66155701475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 66155701475 in words is "sixty-six billion, one hundred fifty-five million, seven hundred one thousand, four hundred seventy-five".