66500556135 has 24 divisors (see below), whose sum is σ = 115215169104. Its totient is φ = 32738734080.

The previous prime is 66500556127. The next prime is 66500556163. The reversal of 66500556135 is 53165500566.

It is not a de Polignac number, because 66500556135 - 2³ = 66500556127 is a prime.

It is a super-2 number, since 2×66500556135² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13113946 + ... + 13119015.

It is an arithmetic number, because the mean of its divisors is an integer number (4800632046).

Almost surely, 2^66500556135 is an apocalyptic number.

66500556135 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66500556135 is a deficient number, since it is larger than the sum of its proper divisors (48714612969).

66500556135 is a wasteful number, since it uses less digits than its factorization.

66500556135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26232995 (or 26232982 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 42.

The spelling of 66500556135 in words is "sixty-six billion, five hundred million, five hundred fifty-six thousand, one hundred thirty-five".