65667655507 has 4 divisors (see below), whose sum is σ = 66317830416. Its totient is φ = 65017480600.

The previous prime is 65667655457. The next prime is 65667655517. The reversal of 65667655507 is 70555676656.

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

It is a cyclic number.

It is not a de Polignac number, because 65667655507 - 2¹⁵ = 65667622739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65667655517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325087303 + ... + 325087504.

It is an arithmetic number, because the mean of its divisors is an integer number (16579457604).

Almost surely, 2^65667655507 is an apocalyptic number.

65667655507 is a deficient number, since it is larger than the sum of its proper divisors (650174909).

65667655507 is a wasteful number, since it uses less digits than its factorization.

65667655507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650174908.

The product of its (nonzero) digits is 39690000, while the sum is 58.

The spelling of 65667655507 in words is "sixty-five billion, six hundred sixty-seven million, six hundred fifty-five thousand, five hundred seven".