66774271542505 has 16 divisors (see below), whose sum is σ = 80343790909200. Its totient is φ = 53276336865280.

The previous prime is 66774271542497. The next prime is 66774271542521. The reversal of 66774271542505 is 50524517247766.

It can be written as a sum of positive squares in 8 ways, for example, as 1323760700304 + 65450510842201 = 1150548^2 + 8090149^2 .

It is not a de Polignac number, because 66774271542505 - 2³ = 66774271542497 is a prime.

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, 16202001 + ... + 19901089.

It is an arithmetic number, because the mean of its divisors is an integer number (5021486931825).

Almost surely, 2^{66774271542505} is an apocalyptic number.

It is an amenable number.

66774271542505 is a deficient number, since it is larger than the sum of its proper divisors (13569519366695).

66774271542505 is a wasteful number, since it uses less digits than its factorization.

66774271542505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708764.

The product of its (nonzero) digits is 98784000, while the sum is 61.

The spelling of 66774271542505 in words is "sixty-six trillion, seven hundred seventy-four billion, two hundred seventy-one million, five hundred forty-two thousand, five hundred five".