66665501155 has 24 divisors (see below), whose sum is σ = 88004876400. Its totient is φ = 48444010560.

The previous prime is 66665501143. The next prime is 66665501171. The reversal of 66665501155 is 55110556666.

It is not a de Polignac number, because 66665501155 - 2¹¹ = 66665499107 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 698716 + ... + 788374.

It is an arithmetic number, because the mean of its divisors is an integer number (3666869850).

Almost surely, 2^66665501155 is an apocalyptic number.

66665501155 is a deficient number, since it is larger than the sum of its proper divisors (21339375245).

66665501155 is a wasteful number, since it uses less digits than its factorization.

66665501155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90915 (or 90904 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 66665501155 in words is "sixty-six billion, six hundred sixty-five million, five hundred one thousand, one hundred fifty-five".