66256250561545 has 32 divisors (see below), whose sum is σ = 88926927027840. Its totient is φ = 46973282979840.

The previous prime is 66256250561521. The next prime is 66256250561561. The reversal of 66256250561545 is 54516505265266.

It is not a de Polignac number, because 66256250561545 - 2¹⁵ = 66256250528777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66256250561545.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26316184 + ... + 28723753.

It is an arithmetic number, because the mean of its divisors is an integer number (2778966469620).

Almost surely, 2^{66256250561545} is an apocalyptic number.

It is an amenable number.

66256250561545 is a deficient number, since it is larger than the sum of its proper divisors (22670676466295).

66256250561545 is a wasteful number, since it uses less digits than its factorization.

66256250561545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55040505.

The product of its (nonzero) digits is 64800000, while the sum is 58.

The spelling of 66256250561545 in words is "sixty-six trillion, two hundred fifty-six billion, two hundred fifty million, five hundred sixty-one thousand, five hundred forty-five".