66815195055 has 32 divisors (see below), whose sum is σ = 122271241728. Its totient is φ = 30520368000.

The previous prime is 66815195053. The next prime is 66815195059. The reversal of 66815195055 is 55059151866.

It is a happy number.

It is not a de Polignac number, because 66815195055 - 2¹ = 66815195053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66815194989 and 66815195007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66815195053) 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, 110896 + ... + 382005.

It is an arithmetic number, because the mean of its divisors is an integer number (3820976304).

Almost surely, 2^66815195055 is an apocalyptic number.

66815195055 is a deficient number, since it is larger than the sum of its proper divisors (55456046673).

66815195055 is a wasteful number, since it uses less digits than its factorization.

66815195055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494207.

The product of its (nonzero) digits is 1620000, while the sum is 51.

The spelling of 66815195055 in words is "sixty-six billion, eight hundred fifteen million, one hundred ninety-five thousand, fifty-five".