65556257087 has 4 divisors (see below), whose sum is σ = 66454288080. Its totient is φ = 64658226096.

The previous prime is 65556257077. The next prime is 65556257113. The reversal of 65556257087 is 78075265556.

It is a happy number.

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 65556257087 - 2¹² = 65556252991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65556257077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449015387 + ... + 449015532.

It is an arithmetic number, because the mean of its divisors is an integer number (16613572020).

Almost surely, 2^65556257087 is an apocalyptic number.

65556257087 is a deficient number, since it is larger than the sum of its proper divisors (898030993).

65556257087 is an equidigital number, since it uses as much as digits as its factorization.

65556257087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898030992.

The product of its (nonzero) digits is 17640000, while the sum is 56.

The spelling of 65556257087 in words is "sixty-five billion, five hundred fifty-six million, two hundred fifty-seven thousand, eighty-seven".