66187196855 has 16 divisors (see below), whose sum is σ = 87148081440. Its totient is φ = 47954494848.

The previous prime is 66187196839. The next prime is 66187196893. The reversal of 66187196855 is 55869178166.

It is not a de Polignac number, because 66187196855 - 2⁴ = 66187196839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9602825 + ... + 9609714.

It is an arithmetic number, because the mean of its divisors is an integer number (5446755090).

Almost surely, 2^66187196855 is an apocalyptic number.

66187196855 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66187196855 is a deficient number, since it is larger than the sum of its proper divisors (20960884585).

66187196855 is a wasteful number, since it uses less digits than its factorization.

66187196855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19212610.

The product of its digits is 21772800, while the sum is 62.

The spelling of 66187196855 in words is "sixty-six billion, one hundred eighty-seven million, one hundred ninety-six thousand, eight hundred fifty-five".