65645556123 has 40 divisors (see below), whose sum is σ = 102184782336. Its totient is φ = 37484000400.

The previous prime is 65645556107. The next prime is 65645556131. The reversal of 65645556123 is 32165554656.

It is not a de Polignac number, because 65645556123 - 2⁴ = 65645556107 is a prime.

It is a super-2 number, since 2×65645556123² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65645556323) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13474378 + ... + 13479248.

Almost surely, 2^65645556123 is an apocalyptic number.

65645556123 is a deficient number, since it is larger than the sum of its proper divisors (36539226213).

65645556123 is an equidigital number, since it uses as much as digits as its factorization.

65645556123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6773 (or 6752 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 48.

The spelling of 65645556123 in words is "sixty-five billion, six hundred forty-five million, five hundred fifty-six thousand, one hundred twenty-three".