66499895537 has 16 divisors (see below), whose sum is σ = 71471548800. Its totient is φ = 61647694080.

The previous prime is 66499895521. The next prime is 66499895549. The reversal of 66499895537 is 73559899466.

It is a cyclic number.

It is not a de Polignac number, because 66499895537 - 2⁴ = 66499895521 is a prime.

It is a super-2 number, since 2×66499895537² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66499895597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1264514 + ... + 1316052.

It is an arithmetic number, because the mean of its divisors is an integer number (4466971800).

Almost surely, 2^66499895537 is an apocalyptic number.

It is an amenable number.

66499895537 is a deficient number, since it is larger than the sum of its proper divisors (4971653263).

66499895537 is a wasteful number, since it uses less digits than its factorization.

66499895537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52696.

The product of its digits is 440899200, while the sum is 71.

The spelling of 66499895537 in words is "sixty-six billion, four hundred ninety-nine million, eight hundred ninety-five thousand, five hundred thirty-seven".