66500556099 has 32 divisors (see below), whose sum is σ = 94281947136. Its totient is φ = 41619432960.

The previous prime is 66500556079. The next prime is 66500556107. The reversal of 66500556099 is 99065500566.

It is not a de Polignac number, because 66500556099 - 2⁷ = 66500555971 is a prime.

It is a super-2 number, since 2×66500556099² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66500556019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1130944 + ... + 1188290.

It is an arithmetic number, because the mean of its divisors is an integer number (2946310848).

Almost surely, 2^66500556099 is an apocalyptic number.

66500556099 is a deficient number, since it is larger than the sum of its proper divisors (27781391037).

66500556099 is a wasteful number, since it uses less digits than its factorization.

66500556099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57755.

The product of its (nonzero) digits is 2187000, while the sum is 51.

The spelling of 66500556099 in words is "sixty-six billion, five hundred million, five hundred fifty-six thousand, ninety-nine".