65640727627 has 4 divisors (see below), whose sum is σ = 65929894056. Its totient is φ = 65351561200.

The previous prime is 65640727609. The next prime is 65640727657. The reversal of 65640727627 is 72672704656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65640727627 is a prime.

It is a super-2 number, since 2×65640727627² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65640727657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144582874 + ... + 144583327.

It is an arithmetic number, because the mean of its divisors is an integer number (16482473514).

Almost surely, 2^65640727627 is an apocalyptic number.

65640727627 is a deficient number, since it is larger than the sum of its proper divisors (289166429).

65640727627 is a wasteful number, since it uses less digits than its factorization.

65640727627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289166428.

The product of its (nonzero) digits is 5927040, while the sum is 52.

The spelling of 65640727627 in words is "sixty-five billion, six hundred forty million, seven hundred twenty-seven thousand, six hundred twenty-seven".