66656505600655 has 16 divisors (see below), whose sum is σ = 80541898269984. Its totient is φ = 52956513060480.

The previous prime is 66656505600647. The next prime is 66656505600691. The reversal of 66656505600655 is 55600650565666.

It is not a de Polignac number, because 66656505600655 - 2³ = 66656505600647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66656505600593 and 66656505600602.

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, 43175001 + ... + 44692210.

It is an arithmetic number, because the mean of its divisors is an integer number (5033868641874).

Almost surely, 2^{66656505600655} is an apocalyptic number.

66656505600655 is a deficient number, since it is larger than the sum of its proper divisors (13885392669329).

66656505600655 is a wasteful number, since it uses less digits than its factorization.

66656505600655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87868266.

The product of its (nonzero) digits is 145800000, while the sum is 61.

The spelling of 66656505600655 in words is "sixty-six trillion, six hundred fifty-six billion, five hundred five million, six hundred thousand, six hundred fifty-five".