66145154525505 has 48 divisors (see below), whose sum is σ = 131657341083840. Its totient is φ = 30382463318400.

The previous prime is 66145154525419. The next prime is 66145154525521. The reversal of 66145154525505 is 50552545154166.

66145154525505 is a `hidden beast` number, since 6 + 6 + 1 + 45 + 1 + 5 + 45 + 2 + 550 + 5 = 666.

It is not a de Polignac number, because 66145154525505 - 2⁹ = 66145154524993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3516479406 + ... + 3516498215.

It is an arithmetic number, because the mean of its divisors is an integer number (2742861272580).

Almost surely, 2^{66145154525505} is an apocalyptic number.

It is an amenable number.

66145154525505 is a deficient number, since it is larger than the sum of its proper divisors (65512186558335).

66145154525505 is a wasteful number, since it uses less digits than its factorization.

66145154525505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032977662 (or 7032977659 counting only the distinct ones).

The product of its (nonzero) digits is 18000000, while the sum is 54.

The spelling of 66145154525505 in words is "sixty-six trillion, one hundred forty-five billion, one hundred fifty-four million, five hundred twenty-five thousand, five hundred five".